Thursday, May 19, 2011

Something you should know about Baseball

Baseball is a bat-and-ball sport played between two teams of nine players each. The goal is to score runs by hitting a thrown ball with a bat and touching a series of four bases arranged at the corners of a ninety-foot square(SONY Vaio VGN-NW Battery), or diamond. Players on one team (the batting team) take turns hitting against the pitcher of the other team (the fielding team), which tries to stop them from scoring runs by getting hitters out in any of several ways. A player on the batting team can stop at any of the bases and later advance via a teammate's hit or other means(SONY Vaio VGN-NW21EF/S Battery). The teams switch between batting and fielding whenever the fielding team records three outs. One turn at bat for each team constitutes an inning and nine innings make up a professional game. The team with the most runs at the end of the game wins(SONY Vaio VGN-NW21MF Battery).

Evolving from older bat-and-ball games, an early form of baseball was being played in England by the mid-eighteenth century. This game and the related rounders were brought by British and Irish immigrants to North America, where the modern version of baseball developed. By the late nineteenth century(SONY Vaio VGN-NW11S/S Battery), baseball was widely recognized as the national sport of the United States. Baseball on the professional, amateur, and youth levels is now popular in North America, parts of Central and South America and the Caribbean, and parts of East Asia. The game is sometimes referred to as hardball, in contrast to the derivative game of softball(SONY Vaio VGN-NW11Z/S Battery).

In North America, professional Major League Baseball (MLB) teams are divided into the National League (NL) and American League (AL). Each league has three divisions: East, West, and Central. Every year, the major league champion is determined by playoffs that culminate in the World Series(SONY Vaio VGN-NW11S/T Battery). Four teams make the playoffs from each league: the three regular season division winners, plus one wild card team. Baseball is the leading team sport in both Japan and Cuba, and the top level of play is similarly split between two leagues: Japan's Central League and Pacific League(SONY Vaio VGN-NW11Z/T Battery); Cuba's West League and East League. In the National and Central leagues, the pitcher is required to bat, per the traditional rules. In the American, Pacific, and both Cuban leagues, there is a tenth player, a designated hitter, who bats for the pitcher. Each top-level team has a farm system of one or more minor league teams(Dell Latitude E4300 battery). These teams allow younger players to develop as they gain on-field experience against opponents with similar levels of skill.

History

Origins of baseball

The evolution of baseball from older bat-and-ball games is difficult to trace with precision. A French manuscript from 1344 contains an illustration of clerics playing a game, possibly la soule, with similarities to baseball(Dell Latitude 2110 battery). Other old French games such as théque, la balle au bâton, and la balle empoisonée also appear to be related. Consensus once held that today's baseball is a North American development from the older game rounders, popular in Great Britain and Ireland. Baseball Before We Knew It: A Search for the Roots of the Game (2005) (Dell Latitude 2100 battery), by David Block, suggests that the game originated in England; recently uncovered historical evidence supports this position. Block argues that rounders and early baseball were actually regional variants of each other, and that the game's most direct antecedents are the English games of stoolball and "tut-ball"(Dell Latitude D830 battery). It has long been believed that cricket also descended from such games, though evidence uncovered in early 2009 suggests that the sport may have been imported to England from Flanders.

The earliest known reference to baseball is in a 1744 British publication, A Little Pretty Pocket-Book, by John Newbery(Dell LATITUDE D820 battery). It contains a rhymed description of "base-ball" and a woodcut that shows a field set-up somewhat similar to the modern game—though in a triangular rather than diamond configuration, and with posts instead of ground-level bases. English lawyer William Bray recorded a game of baseball on Easter Monday 1755 in Guildford, Surrey(Dell Latitude D810 battery); Bray's diary was verified as authentic in September 2008. This early form of the game was apparently brought to North America by English immigrants. Rounders was also brought to the continent by both British and Irish immigrants. The first known American reference to baseball appears in a 1791 Pittsfield, Massachusetts(Dell LATITUDE D800 battery), town bylaw prohibiting the playing of the game near the town's new meeting house. By 1796, a version of the game was well-known enough to earn a mention in a German scholar's book on popular pastimes. As described by Johann Gutsmuths, "englische Base-ball" involved a contest between two teams(Dell Latitude D630 battery), in which "the batter has three attempts to hit the ball while at the home plate". Only one out was required to retire a side.

By the early 1830s, there were reports of a variety of uncodified bat-and-ball games recognizable as early forms of baseball being played around North America. These games were often referred to locally as "town ball", though other names such as "round-ball" and "base-ball" were also used(Dell Latitude D620 battery). Among the earliest examples to receive a detailed description—albeit five decades after the fact, in a letter from an attendee to Sporting Life magazine—took place in Beachville, Ontario, in 1838. There were many similarities to modern baseball, and some crucial differences(Dell Latitude D610 battery): five bases (or byes); first bye just 18 feet (5.5 m) from the home bye; batter out if a hit ball was caught after the first bounce. The once widely accepted story that Abner Doubleday invented baseball in Cooperstown, New York, in 1839 has been conclusively debunked by sports historians(Dell Latitude D600 battery).

In 1845, Alexander Cartwright, a member of New York City's Knickerbockers club, led the codification of the so-called Knickerbocker Rules. The practice, common to bat-and-ball games of the day, of "soaking" or "plugging"—effecting a putout by hitting a runner with a thrown ball—was barred(Dell Latitude D520 battery). The rules thus facilitated the use of a smaller, harder ball than had been common. Several other rules also brought the Knickerbockers' game close to the modern one, though a ball caught on the first bounce was, again, an out and only underhand pitching was allowed. While there are reports that the New York Knickerbockers played games in 1845(Dell Latitude D510 battery), the contest now recognized as the first officially recorded baseball game in U.S. history took place on June 19, 1846, in Hoboken, New Jersey: the "New York Nine" defeated the Knickerbockers, 23–1, in four innings. With the Knickerbocker code as the basis, the rules of modern baseball continued to evolve over the next half-century(Dell Latitude D505 battery).

History of baseball in the United States

The game turns professional

In the mid-1850s, a baseball craze hit the New York metropolitan area. By 1856, local journals were referring to baseball as the "national pastime" or "national game". A year later, sixteen area clubs formed the sport's first governing body, the National Association of Base Ball Players(Dell Latitude D500 battery). In 1863, the organization disallowed putouts made by catching a fair ball on the first bounce. Four years later, it barred participation by African Americans. The game's commercial potential was developing: in 1869 the first fully professional baseball club, the Cincinnati Red Stockings(Dell Latitude D430 battery), was formed and went undefeated against a schedule of semipro and amateur teams. The first professional league, the National Association of Professional Base Ball Players, lasted from 1871 to 1875; scholars dispute its status as a major league(Dell Latitude D420 battery).

The more formally structured National League was founded in 1876. As the oldest surviving major league, the National League is sometimes referred to as the "senior circuit". Several other major leagues formed and failed. In 1884, African American Moses Walker (and, briefly, his brother Welday) played in one of these(Dell Latitude D410 battery), the American Association. An injury ended Walker's major league career, and by the early 1890s, a gentlemen's agreement in the form of the baseball color line effectively barred black players from the white-owned professional leagues, major and minor. Professional Negro leagues formed, but quickly folded(Dell Latitude CPX battery). Several independent African American teams succeeded as barnstormers. Also in 1884, overhand pitching was legalized. In 1887, softball, under the name of indoor baseball or indoor-outdoor, was invented as a winter version of the parent game. Virtually all of the modern baseball rules were in place by 1893(Dell Latitude CPI battery); the last major change—counting foul balls as strikes—was instituted in 1901. The National League's first successful counterpart, the American League, which evolved from the minor Western League, was established that year(Dell Latitude C840 battery). The two leagues, each with eight teams, were rivals that fought for the best players, often disregarding each other's contracts and engaging in bitter legal disputes.

The New York Giants baseball team, 1913. Fred Merkle, sixth in line, committed a baserunning gaffe in a crucial 1908 game that became famous as Merkle's Boner(Dell Latitude C810 battery).

A modicum of peace was eventually established, leading to the National Agreement of 1903. The pact formalized relations both between the two major leagues and between them and the National Association of Professional Base Ball Leagues, representing most of the country's minor professional leagues. The World Series, pitting the two major league champions against each other, was inaugurated that fall(Dell Latitude C800 battery), albeit without express major league sanction: The Boston Americans of the American League defeated the Pittsburgh Pirates of the National League. The next year, the series was not held, as the National League champion New York Giants, under manager John McGraw(Dell Latitude C640 battery), refused to recognize the major league status of the American League and its champion. In 1905, the Giants were National League champions again and team management relented, leading to the establishment of the World Series as the major leagues' annual championship event(Dell Latitude C610 battery).

As professional baseball became increasingly profitable, players frequently raised grievances against owners over issues of control and equitable income distribution. During the major leagues' early decades, players on various teams occasionally attempted strikes, which routinely failed when their jobs were sufficiently threatened(Dell Latitude C600 battery). In general, the strict rules of baseball contracts and the reserve clause, which bound players to their teams even when their contracts had ended, tended to keep the players in check. Motivated by dislike for particularly stingy owner Charles Comiskey and gamblers' payoffs, real and promised(Dell Latitude C540 battery), members of the Chicago White Sox conspired to throw the 1919 World Series. The Black Sox Scandal led to the formation of a new National Commission of baseball that drew the two major leagues closer together(Dell Latitude C510 battery). The first major league baseball commissioner, Kenesaw Mountain Landis, was elected in 1920. That year also saw the founding of the Negro National League; the first significant Negro league, it would operate until 1931. For part of the 1920s, it was joined by the Eastern Colored League(Dell Latitude C500 battery).

Rise of Ruth and racial integration

Compared with the present, professional baseball in the early twentieth century was lower scoring and pitchers, the likes of Walter Johnson and Christy Mathewson, were more dominant. The "inside game", which demanded that players "scratch for runs", was played much more aggressively than it is today(Dell Latitude C400 battery): the brilliant and often violent Ty Cobb epitomized this style. The so-called dead-ball era ended in the early 1920s with several changes in rule and circumstance that were advantageous to hitters. Strict new regulations governing the ball's size, shape and composition, coupled with superior materials available after World War I(Dell Latitude 131L battery), resulted in a ball that traveled farther when hit. The construction of additional seating to accommodate the rising popularity of the game often had the effect of bringing the outfield fences closer in, making home runs more common(Dell Latitude D400 battery). The rise of the legendary player Babe Ruth, the first great power hitter of the new era, helped permanently alter the nature of the game. The club with which Ruth set most of his slugging records, the New York Yankees, built a reputation as the majors' premier team. In the late 1920s and early 1930s(Dell XPS 1647 battery), St. Louis Cardinals general manager Branch Rickey invested in several minor league clubs and developed the first modern "farm system".A new Negro National League was organized in 1933; four years later, it was joined by the Negro American League. The first elections to the Baseball Hall of Fame took place in 1936(Dell XPS 1645 battery). In 1939 Little League Baseball was founded in Pennsylvania. By the late 1940s, it was the organizing body for children's baseball leagues across the United States.

Jackie Robinson in 1945, with the era's Kansas City Royals, a barnstorming squad associated with the Negro American League's Kansas City Monarchs(Dell XPS 1640 battery)

With America's entry into World War II, many professional players had left to serve in the armed forces. A large number of minor league teams disbanded as a result and the major league game seemed under threat as well. Chicago Cubs owner Philip K. Wrigley led the formation of a new professional league with women players to help keep the game in the public eye (Dell XPS 16 battery)— the All-American Girls Professional Baseball League existed from 1943 to 1954. The inaugural College World Series was held in 1947, and the Babe Ruth League youth program was founded. This program soon became another important organizing body for children's baseball(Dell XPS 13 battery). The first crack in the unwritten agreement barring blacks from white-controlled professional ball occurred the previous year: Jackie Robinson was signed by the National League's Brooklyn Dodgers—where Branch Rickey had become general manager—and began playing for their minor league team in Montreal In 1947(Dell XPS M140 battery), Robinson broke the major leagues' color barrier when he debuted with the Dodgers. Larry Doby debuted with the American League's Cleveland Indians the same year. Latin American players, largely overlooked before, also started entering the majors in greater numbers. In 1951, two Chicago White Sox(Dell Inspiron Mini 12 battery), Venezuelan-born Chico Carrasquel and black Cuban-born Minnie Miñoso, became the first Hispanic All-Stars.

Facing competition as varied as television and football, baseball attendance at all levels declined. While the majors rebounded by the mid-1950s, the minor leagues were gutted and hundreds of semipro and amateur teams dissolved. Integration proceeded slowly(Dell XPS M2010 battery): by 1953, only six of the sixteen major league teams had a black player on the roster. That year, the Major League Baseball Players Association was founded. It was the first professional baseball union to survive more than briefly, but it remained largely ineffective for years(Dell XPS M1730 battery). No major league team had been located west of St. Louis until 1958, when the Brooklyn Dodgers and New York Giants relocated to Los Angeles and San Francisco, respectively. The majors' final all-white bastion, the Boston Red Sox, added a black player in 1959(Dell XPS M1710 battery). With the integration of the majors drying up the available pool of players, the last Negro league folded the following year. In 1961, the American League reached the West Coast with the Los Angeles Angels expansion team, and the major league season was extended from 154 games to 162(Dell XPS M170 battery). This coincidentally helped Roger Maris break Babe Ruth's long-standing single-season home run record, one of the most celebrated marks in baseball. Along with the Angels, three other new franchises were launched during 1961–62. With this, the first major league expansion in sixty years, each league now had ten teams(Dell XPS M1530 battery).

Attendance records and the age of steroids

The players' union became bolder under the leadership of former United Steelworkers chief economist and negotiator Marvin Miller, who was elected executive director in 1966. On the playing field, major league pitchers were becoming increasingly dominant again(Dell XPS 1340 battery). After the 1968 season, in an effort to restore balance, the strike zone was reduced and the height of the pitcher's mound was lowered. The following year, both the National and American leagues added two more expansion teams, the leagues were reorganized into two divisions each(Dell XPS M1330 battery), and a post-season playoff system leading to the World Series was instituted. Also in 1969, Curt Flood of the St. Louis Cardinals made the first serious legal challenge to the reserve clause. The major leagues' first general players' strike took place in 1972(Dell XPS M1210 battery). In another effort to add more offense to the game, the American League adopted the designated hitter rule the following year. In 1975, the union's power—and players' salaries—began to increase greatly when the reserve clause was effectively struck down, leading to the free agency system. In 1977(Dell INSPIRON MINI 9 battery), two more expansion teams joined the American League. Significant work stoppages occurred again in 1981 and 1994, the latter forcing the cancellation of the World Series for the first time in ninety years. Attendance had been growing steadily since the mid-1970s and in 1994, before the stoppage(Dell STUDIO 1450 battery), the majors were setting their all-time record for per-game attendance.

In May 2010, the Philadelphia Phillies' Roy Halladay pitched the twentieth major league perfect game. That October, he pitched only the second no-hitter in MLB postseason history(Dell VOSTRO 1400 battery).

The addition of two more expansion teams after the 1993 season had facilitated another restructuring of the major leagues, this time into three divisions each. Offensive production—the number of home runs in particular—had surged that year, and again in the abbreviated 1994 season. After play resumed in 1995(Dell VOSTRO 1500 battery), this trend continued and non-division-winning wild card teams became a permanent fixture of the post-season. Regular-season interleague play was introduced in 1997 and the second-highest attendance mark for a full season was set. The next year, Mark McGwire and Sammy Sosa both surpassed Maris's decades-old single season home run record and two more expansion franchises were added(Dell XPS M1210 battery). In 2000, the National and American leagues were dissolved as legal entities. While their identities were maintained for scheduling purposes (and the designated hitter distinction), the regulations and other functions—such as player discipline and umpire supervision—they had administered separately were consolidated under the rubric of Major League Baseball (MLB) (Dell XPS M1330 battery).

In 2001, Barry Bonds established the current record of 73 home runs in a single season. There had long been suspicions that the dramatic increase in power hitting was fueled in large part by the abuse of illegal steroids (as well as by the dilution of pitching talent due to expansion) (Dell XPS 1340 battery), but the issue only began attracting significant media attention in 2002 and there was no penalty for the use of performance-enhancing drugs before 2004. In 2007, Bonds became MLB's all-time home run leader, surpassing Hank Aaron, as total major league and minor league attendance both reached all-time highs(Dell XPS M1530 battery). Even though McGwire, Sosa, and Bonds—as well as many other players, including storied pitcher Roger Clemens—have been implicated in the steroid abuse scandal, their feats and those of other sluggers had become the major leagues' defining attraction(Dell XPS M170 battery). In contrast to the professional game's resurgence in popularity after the 1994 interruption, Little League enrollment was in decline: after peaking in 1996, it dropped 1 percent a year over the following decade. With more rigorous testing and penalties for performance-enhancing drug use a possible factor(Dell XPS M1710 battery), the balance between bat and ball swung markedly in 2010, which became known as the "Year of the Pitcher".Runs per game fell to their lowest level in 18 years, and the strikeout rate was higher than it had been in half a century.

Baseball around the world

Baseball, widely known as America's pastime, is well-established in several other countries as well(Dell XPS M1730 battery). The history of baseball in Canada has remained closely linked with that of the sport in the United States. As early as 1877, a professional league, the International Association, featured teams from both countries. While baseball is widely played in Canada and many minor league teams have been based in the country(Dell XPS M2010 battery), the American major leagues did not include a Canadian club until 1969, when the Montreal Expos joined the National League as an expansion team. In 1977, the expansion Toronto Blue Jays joined the American League. The Blue Jays won the World Series in 1992 and 1993, the first and still the only club from outside the United States to do so(Dell Inspiron Mini 12 battery). After the 2004 season, Major League Baseball relocated the Expos to Washington, D.C., where the team is now known as the Nationals.

Sadaharu Oh managing the Japan national team in the 2006 World Baseball Classic. Playing for the Central League's Yomiuri Giants (1959–80), Oh set the professional world record for home runs(SONY VGP-BPS9A/S battery).

In 1847, American soldiers played what may have been the first baseball game in Mexico at Parque Los Berros in Xalapa, Veracruz. A few days after the Battle of Cerro Gordo, they used the "wooden leg captured (by the Fourth Illinois regiment) from General Santa Anna"(SONY VGP-BPS9/B battery). The first formal baseball league outside of the United States and Canada was founded in 1878 in Cuba, which maintains a rich baseball tradition and whose national team has been one of the world's strongest since international play began in the late 1930s (all organized baseball in the country has officially been amateur since the Cuban Revolution) (SONY VGP-BPS9/S battery). The Dominican Republic held its first islandwide championship tournament in 1912.[69] Professional baseball tournaments and leagues began to form in other countries between the world wars, including the Netherlands (formed in 1922), Australia (1934), Japan (1936), Mexico (1937), and Puerto Rico (1938) (SONY VGP-BPS9A battery). The Japanese major leagues—the Central League and Pacific League—have long been considered the highest quality professional circuits outside of the United States. Japan has a professional minor league system as well, though it is much smaller than the American version—each team has only one farm club in contrast to MLB teams' four or five(SONY VGP-BPS9A/B battery).

After World War II, professional leagues were founded in many Latin American nations, most prominently Venezuela (1946) and the Dominican Republic (1955). Since the early 1970s, the annual Caribbean Series has matched the championship clubs from the four leading Latin American winter leagues(HP Pavilion DV6-1210SA battery): the Dominican Winter League, Mexican Pacific League, Puerto Rican Professional Baseball League, and Venezuelan Professional Baseball League. In Asia, South Korea (1982), Taiwan (1990), and China (2003) all have professional leagues.

Many European countries have professional leagues as well, the most successful, other than the Dutch league(SONY VGP-BPS11 battery), being the Italian league founded in 1948. Compared to those in Asia and Latin America, the various European leagues and the one in Australia historically have had no more than niche appeal. In 2004, Australia won a surprise silver medal at the Olympic Games(SONY VGP-BPL11 battery). The Israel Baseball League, launched in 2007, folded after one season. The Confédération Européene de Baseball (European Baseball Confederation), founded in 1953, organizes a number of competitions between clubs from different countries, as well as national squads. Other competitions between national teams(SONY VGP-BPL12 battery), such as the Baseball World Cup and the Olympic baseball tournament, have been administered by the International Baseball Federation (IBAF) since its formation in 1938. As of 2009, the IBAF has 117 member countries. Women's baseball is played on an organized amateur basis in many of the countries where it is a leading men's sport(SONY VGP-BPS12 battery). Since 2004, the IBAF has sanctioned the Women's Baseball World Cup, featuring national teams.

After being admitted to the Olympics as a medal sport beginning with the 1992 Games, baseball was dropped from the 2012 Summer Olympic Games at the 2005 International Olympic Committee meeting(SONY VGP-BPS14 Battery). It remained part of the 2008 Games. The elimination of baseball, along with softball, from the 2012 Olympic program enabled the IOC to consider adding two different sports, but none received the votes required for inclusion. While the sport's lack of a following in much of the world was a factor, more important was Major League Baseball's reluctance to have a break during the Games to allow its players to participate(SONY VGP-BPS14/B Battery), as the National Hockey League now does during the Winter Olympic Games. Such a break is more difficult for MLB to accommodate because it would force the playoffs deeper into cold weather. Seeking reinstatement for the 2016 Summer Olympics, the IBAF proposed an abbreviated competition designed to facilitate the participation of top players, but the effort failed(SONY VGP-BPS14/S Battery). Major League Baseball initiated the World Baseball Classic, scheduled to precede the major league season, partly as a replacement, high-profile international tournament. The inaugural Classic, held in March 2006, was the first tournament involving national teams to feature a significant number of MLB participants(SONY VGP-BPS14B Battery).

Rules and gameplay

A game is played between two teams, each composed of nine players, that take turns playing offense (batting or hitting) and defense (fielding or pitching). A pair of turns, one at bat and one in the field, by each team constitutes an inning. A game consists of nine innings. One team—customarily the visiting team—bats in the top(SONY VGP-BPS22 battery), or first half, of every inning. The other team—customarily the home team—bats in the bottom, or second half, of every inning. The goal of the game is to score more points (runs) than the other team. The players on the team at bat attempt to score runs by circling or completing a tour of the four bases set at the corners of the square-shaped baseball diamond(SONY VGP-BPS18 battery). A player bats at home plate and must proceed counterclockwise to first base, second base, third base, and back home in order to score a run. The team in the field attempts both to prevent runs from scoring and to record outs, which remove opposing players from offensive action until their turn in their team's batting order comes up again(SONY VGP-BPS22/A battery). When three outs are recorded, the teams switch roles for the next half-inning. If the score of the game is tied after nine innings, extra innings are played to resolve the contest. Children's games are often scheduled for fewer than nine innings.

Diagram of a baseball field (the term diamond may be used to refer to the square area defined by the four bases or to the entire playing field) (SONY VGP-BPS22A battery). The dimensions given are for professional and professional-style games. Children often play on smaller fields.

The game is played on a field whose primary boundaries, the foul lines, extend forward from home plate at 45-degree angles. The 90-degree area within the foul lines is referred to as fair territory; the 270-degree area outside them is foul territory(SONY VGP-BPL10 battery). The part of the field enclosed by the bases and several yards beyond them is the infield; the area farther beyond the infield is the outfield. In the middle of the infield is a raised pitcher's mound, with a rectangular rubber plate (the rubber) at its center. The outer boundary of the outfield is typically demarcated by a raised fence(SONY VGP-BPS10 battery), which may be of any material and height (many amateur games are played on unfenced fields). Fair territory between home plate and the outfield boundary is baseball's field of play, though significant events can take place in foul territory, as well.

There are three basic tools of baseball: the ball, the bat, and the glove or mitt(Dell Latitude E6500 battery):

The baseball is about the size of an adult's fist, around 9 inches (23 centimeters) in circumference. It has a rubber or cork center, wound in yarn and covered in white cowhide, with red stitching.

The bat is a hitting tool, traditionally made of a single, solid piece of wood. Other materials are now commonly used for nonprofessional games(Dell Latitude E6400 battery). It is a hard round stick, about 2.5 inches (6.4 centimeters) in diameter at the hitting end, tapering to a narrower handle and culminating in a knob. Bats used by adults are typically around 34 inches (86 centimeters) long, and not longer than 42 inches (106 centimeters) (Dell Latitude E5400 battery).

The glove or mitt is a fielding tool, made of padded leather with webbing between the fingers. As an aid in catching and holding onto the ball, it takes various shapes to meet the specific needs of different fielding positions.

Protective helmets are also standard equipment for all batters(SONY Vaio VGN-CR23/W battery).

At the beginning of each half-inning, the nine players on the fielding team arrange themselves around the field. One of them, the pitcher, stands on the pitcher's mound. The pitcher begins the pitching delivery with one foot on the rubber, pushing off it to gain velocity when throwing toward home plate(SONY Vaio VGN-CR23/N battery). Another player, the catcher, squats on the far side of home plate, facing the pitcher. The rest of the team faces home plate, typically arranged as four infielders—who set up along or within a few yards outside the imaginary lines between first, second, and third base—and three outfielders(SONY Vaio VGN-CR23/L battery). In the standard arrangement, there is a first baseman positioned several steps to the left of first base, a second baseman to the right of second base, a shortstop to the left of second base, and a third baseman to the right of third base. The basic outfield positions are left fielder, center fielder, and right fielder. A neutral umpire sets up behind the catcher(SONY Vaio VGN-CR23/R battery).

Awaiting a pitch: batter, catcher, and umpire

Play starts with a batter standing at home plate, holding a bat. The batter waits for the pitcher to throw a pitch (the ball) toward home plate, and attempts to hit the ball with the bat. The catcher catches pitches that the batter does not hit—as a result of either electing not to swing or failing to connect—and returns them to the pitcher(SONY Vaio VGN-CR23/P battery). A batter who hits the ball into the field of play must drop the bat and begin running toward first base, at which point the player is referred to as a runner (or, until the play is over, a batter-runner). A batter-runner who reaches first base without being put out (see below) is said to be safe and is now on base(SONY Vaio VGN-CR23/B battery). A batter-runner may choose to remain at first base or attempt to advance to second base or even beyond—however far the player believes can be reached safely. A player who reaches base despite proper play by the fielders has recorded a hit. A player who reaches first base safely on a hit is credited with a single(SONY Vaio VGN-CR21Z/R battery). If a player makes it to second base safely as a direct result of a hit, it is a double; third base, a triple. If the ball is hit in the air within the foul lines over the entire outfield (and outfield fence, if there is one), it is a home run: the batter and any runners on base may all freely circle the bases, each scoring a run. This is the most desirable result for the batter(SONY Vaio VGN-CR21Z/N battery). A player who reaches base due to a fielding mistake is not credited with a hit—instead, the responsible fielder is charged with an error.

Any runners already on base may attempt to advance on batted balls that land, or contact the ground, in fair territory, before or after the ball lands. A runner on first base must attempt to advance if a ball lands in play(SONY Vaio VGN-CR21S/W battery). If a ball hit into play rolls foul before passing through the infield, it becomes dead and any runners must return to the base they were at when the play began. If the ball is hit in the air and caught before it lands, the batter has flied out and any runners on base may attempt to advance only if they tag up or touch the base they were at when the play began(SONY Vaio VGN-CR21S/P battery), as or after the ball is caught. Runners may also attempt to advance to the next base while the pitcher is in the process of delivering the ball to home plate—a successful effort is a stolen base.

A pitch that is not hit into the field of play is called either a strike or a ball. A batter against whom three strikes are recorded strikes out(SONY Vaio VGN-CR21S/L battery). A batter against whom four balls are recorded is awarded a base on balls or walk, a free advance to first base. (A batter may also freely advance to first base if any part of the batter's body or uniform is struck by a pitch before the batter either swings at it or it contacts the ground.) (SONY Vaio VGN-CR21E/W battery) Crucial to determining balls and strikes is the umpire's judgment as to whether a pitch has passed through the strike zone, a conceptual area above home plate extending from the midpoint between the batter's shoulders and belt down to the hollow of the knee(SONY Vaio VGN-CR21E/P battery).

A strike is called when one of the following happens:

The batter lets a well-pitched ball (one within the strike zone) go through to the catcher.

The batter swings at any ball (even one outside the strike zone) and misses, or foul tips it directly into the catcher's hands(SONY Vaio VGN-CR21E/L battery).

The batter hits a foul ball—one that either initially lands in foul territory or initially lands within the diamond but moves into foul territory before passing first or third base. If there are already two strikes on the batter, a foul ball is not counted as a third strike; thus, a foul ball cannot result in the immediate strikeout of the batter(SONY Vaio VGN-CR21/B battery). (There is an exception to this exception: a two-strike foul bunt is recorded as a third strike.)

A ball is called when the pitcher throws a pitch that is outside the strike zone, provided the batter has not swung at it.

A shortstop tries to tag out a runner who is sliding headfirst, attempting to reach second base(SONY Vaio VGN-CR15/B battery).

While the team at bat is trying to score runs, the team in the field is attempting to record outs. Among the various ways a member of the batting team may be put out, five are most common:

The strikeout: as described above, recorded against a batter who makes three strikes before putting the ball into play or being awarded a free advance to first base(SONY Vaio VGN-CR13T/W battery).

The flyout: as described above, recorded against a batter who hits a ball in the air that is caught by a fielder, whether in fair territory or foul territory, before it lands, whether or not the batter has run.

The ground out: recorded against a batter (in this case, batter-runner) who hits a ball that lands in fair territory which, before the batter-runner can reach first base(SONY Vaio VGN-CR13T/R battery), is retrieved by a fielder who touches first base while holding the ball or relays it to another fielder who touches first base while holding the ball.

The force out: recorded against a runner who is required to attempt to advance—either because the runner is on first base and a batted ball lands in fair territory(SONY Vaio VGN-CR13T/P battery), or because the runner immediately behind on the basepath is thus required to attempt to advance—but fails to reach the next base before a fielder touches the base while holding the ball. The ground out is technically a special case of the force out.

The tag out: recorded against a runner who is touched by a fielder with the ball or a glove holding the ball, while the runner is not touching a base(SONY Vaio VGN-CR13T/L battery).

It is possible to record two outs in the course of the same play—a double play. Even three—a triple play—is possible, though this is very rare. Players put out or retired must leave the field, returning to their team's dugout or bench. A runner may be stranded on base when a third out is recorded against another player on the team. Stranded runners do not benefit the team in its next turn at bat—every half-inning begins with the bases empty of runners(SONY Vaio VGN-CR13/W battery).

An individual player's turn batting or plate appearance is complete when the player reaches base, hits a home run, makes an out, or hits a ball that results in the team's third out, even if it is recorded against a teammate. On rare occasions, a batter may be at the plate when, without the batter's hitting the ball(SONY Vaio VGN-CR13/R battery), a third out is recorded against a teammate—for instance, a runner getting caught stealing (tagged out attempting to steal a base). A batter with this sort of incomplete plate appearance starts off the team's next turn batting; any balls or strikes recorded against the batter the previous inning are erased(SONY Vaio VGN-CR13/P battery). A runner may circle the bases only once per plate appearance and thus can score at most a single run per batting turn. Once a player has completed a plate appearance, that player may not bat again until the eight other members of the player's team have all taken their turn at bat. The batting order is set before the game begins(SONY Vaio VGN-CR13/L battery), and may not be altered except for substitutions. Once a player has been removed for a substitute, that player may not reenter the game. Children's games often have more liberal substitution rules(SONY Vaio VGN-CR13/B battery).

If the designated hitter (DH) rule is in effect, each team has a tenth player whose sole responsibility is to bat (and run). The DH takes the place of another player—almost invariably the pitcher—in the batting order, but does not field. Thus, even with the DH, each team still has a batting order of nine players and a fielding arrangement of nine players(SONY Vaio VGN-CR11Z/R battery).

Personnel

Player rosters

Relief pitchers warming up, overseen by a bullpen coach. A manager will often have both a right-handed and a left-handed reliever warm up to maximize strategic options.

Roster, or squad, sizes differ between different leagues and different levels of organized play. Major League Baseball teams maintain twenty-five-player active rosters(SONY Vaio VGN-CR11S/W battery). A typical twenty-five-man roster in a league without the DH rule, such as MLB's National League, features:

eight position players—catcher, four infielders, three outfielders—who play on a regular basis

five starting pitchers who constitute the team's pitching rotation or starting rotation

six relief pitchers, including one specialist closer, who constitute the team's bullpen (named for the off-field area where pitchers warm up) (SONY Vaio VGN-CR11S/P battery)

one backup, or substitute, catcher

two backup infielders

two backup outfielders

one specialist pinch hitter, or a second backup catcher, or a seventh reliever

Other personnel

The manager, or head coach of a team, oversees the team's major strategic decisions, such as establishing the starting rotation, setting the lineup, or batting order, before each game, and making substitutions during games—in particular(SONY Vaio VGN-CR11S/L battery), bringing in relief pitchers. Managers are typically assisted by two or more coaches; they may have specialized responsibilities, such as working with players on hitting, fielding, pitching, or strength and conditioning. At most levels of organized play, two coaches are stationed on the field when the team is at bat(SONY VAIO VGN-NR11Z battery): the first base coach and third base coach, occupying designated coaches' boxes just outside the foul lines, assist in the direction of baserunners when the ball is in play, and relay tactical signals from the manager to batters and runners during pauses in play. In contrast to many other team sports(SONY VAIO VGN-NR11S battery), baseball managers and coaches generally wear their team's uniforms; coaches must be in uniform in order to be allowed on the playing field during a game.

Any baseball game involves one or more umpires, who make rulings on the outcome of each play. At a minimum, one umpire will stand behind the catcher, to have a good view of the strike zone, and call balls and strikes(SONY VAIO VGN-NR110E battery). Additional umpires may be stationed near the other bases, thus making it easier to judge plays such as attempted force outs and tag outs. In Major League Baseball, four umpires are used for each game, one near each base. In the playoffs, six umpires are used: one at each base and two in the outfield along the foul lines(SONY VGN-CR11Z battery).

Strategy and tactics

Many of the pre-game and in-game strategic decisions in baseball revolve around a fundamental fact: in general, right-handed batters tend to be more successful against left-handed pitchers and, to an even greater degree, left-handed batters tend to be more successful against right-handed pitchers(SONY VGN-CR11S battery). A manager with several left-handed batters in the regular lineup who knows the team will be facing a left-handed starting pitcher may respond by starting one or more of the right-handed backups on the team's roster. During the late innings of a game, as relief pitchers and pinch hitters are brought in(SONY VGN-CR11M battery), the opposing managers will often go back and forth trying to create favorable matchups with their substitutions: the manager of the fielding team trying to arrange same-handed pitcher-batter matchups, the manager of the batting team trying to arrange opposite-handed matchups. With a team that has the lead in the late innings(SONY VGN-CR11E battery), a manager may remove a starting position player—especially one whose turn at bat is not likely to come up again—for a more skillful fielder.

Pitching and fielding tactics

A first baseman receives a pickoff throw, as the runner dives back to first base.

The tactical decision that precedes almost every play in a baseball game involves pitch selection. Among the wide variety of pitches that may be thrown(SONY VGN-CR21E battery), the four basic types are the fastball, the changeup (or off-speed pitch), and two breaking balls—the curveball and the slider. Pitchers have different repertoires of pitches they are skillful at throwing. Conventionally, before each pitch, the catcher signals the pitcher what type of pitch to throw(SONY VGN-CR21S battery), as well as its general vertical and/or horizontal location. If there is disagreement on the selection, the pitcher may shake off the sign and the catcher will call for a different pitch. With a runner on base and taking a lead, the pitcher may attempt a pickoff, a quick throw to a fielder covering the base to keep the runner's lead in check or(SONY VGN-CR21Z battery), optimally, effect a tag out. If an attempted stolen base is anticipated, the catcher may call for a pitchout, a ball thrown deliberately off the plate, allowing the catcher to catch it while standing and throw quickly to a base. Facing a batter with a strong tendency to hit to one side of the field(SONY VGN-CR21SR battery), the fielding team may employ a shift, with most or all of the fielders moving to the left or right of their usual positions. With a runner on third base, the infielders may play in, moving closer to home plate to improve the odds of throwing out the runner on a ground ball, though a sharply hit grounder is more likely to carry through a drawn-in infield(SONY VGN-CR31S battery).

Batting and baserunning tactics

A batter squares to bunt, moving his hands up the barrel of the bat to increase his control and deaden the ball on impact.

Several basic offensive tactics come into play with a runner on first base, including the fundamental choice of whether to attempt a steal of second base. The hit and run is sometimes employed with a skillful contact hitter(SONY VGN-CR31E battery): the runner takes off with the pitch drawing the shortstop or second baseman over to second base, creating a gap in the infield for the batter to poke the ball through. The sacrifice bunt calls for the batter to focus on making contact with the ball so that it rolls a short distance into the infield(SONY VGN-CR31Z battery), allowing the runner to advance into scoring position even at the expense of the batter being thrown out at first—a batter who succeeds is credited with a sacrifice. (A batter, particularly one who is a fast runner, may also attempt to bunt for a hit.) A sacrifice bunt employed with a runner on third base, aimed at bringing that runner home, is known as a squeeze play(SONY VGN-CR41Z battery). With a runner on third and fewer than two outs, a batter may instead concentrate on hitting a fly ball that, even if it is caught, will be deep enough to allow the runner to tag up and score—a successful batter in this case gets credit for a sacrifice fly. The manager will sometimes signal a batter who is ahead in the count (i.e., has more balls than strikes) to take, or not swing at, the next pitch(SONY VGN-CR41S battery).

Distinctive elements

Baseball has certain attributes that set it apart from the other popular team sports in the countries where it has a following, games such as American and Canadian football, basketball, ice hockey, and soccer. All of these sports use a clock; in all of them, play is less individual and more collective(SONY VGN-CR41E battery); and in none of them is the variation between playing fields nearly as substantial or important. The comparison between cricket and baseball demonstrates that many of baseball's distinctive elements are shared in various ways with its cousin sport(SONY VGN-CR42Z battery).

No clock to kill

A well-worn baseball

In clock-limited sports, games often end with a team that holds the lead killing the clock rather than competing aggressively against the opposing team. In contrast, baseball has no clock; a team cannot win without getting the last batter out and rallies are not constrained by time(SONY VGN-CR42S battery). At almost any turn in any baseball game, the most advantageous strategy is some form of aggressive strategy. In contrast, again, the clock comes into play even in the case of multi-day Test and first-class cricket: the possibility of a draw often encourages a team that is batting last and well behind to bat defensively, giving up any faint chance at a win to avoid a loss. Baseball offers no such reward for conservative batting(SONY VGN-CR42E battery).

While nine innings has been the standard since the beginning of professional baseball, the duration of the average major league game has increased steadily through the years. At the turn of the twentieth century, games typically took an hour and a half to play. In the 1920s, they averaged just less than two hours(SONY Vaio VGN-FW31J Battery), which eventually ballooned to 2:38 in 1960. By 1997, the average American League game lasted 2:57 (National League games were about 10 minutes shorter—pitchers at the plate making for quicker outs than designated hitters). In 2004, Major League Baseball declared that its goal was an average game of merely 2:45(SONY Vaio VGN-FW32J Battery). The lengthening of games is attributed to longer breaks between half-innings for television commercials, increased offense, more pitching changes, and a slower pace of play with pitchers taking more time between each delivery, and batters stepping out of the box more frequently(SONY Vaio VGN-FW17W Battery). Other leagues have experienced similar issues. In 2008, Nippon Professional Baseball took steps aimed at shortening games by 12 minutes from the preceding decade's average of 3:18.

Individual focus

For a team sport, baseball places individual players under unusual scrutiny and pressure. In 1915, a baseball instructional manual pointed out that every single pitch, of which there are often more than two hundred in a game(SONY Vaio VGN-FW31E Battery), involves an individual, one-on-one contest: "the pitcher and the batter in a battle of wits". Contrasting the game with both football and basketball, scholar Michael Mandelbaum argues that "baseball is the one closest in evolutionary descent to the older individual sports"(SONY Vaio VGN-FW139E Battery). Pitcher, batter, and fielder all act essentially independent of each other. While coaching staffs can signal pitcher or batter to pursue certain tactics, the execution of the play itself is a series of solitary acts. If the batter hits a line drive, the outfielder is solely responsible for deciding to try to catch it or play it on the bounce and for succeeding or failing(SONY Vaio VGN-FW139E/H Battery). The statistical precision of baseball is both facilitated by this isolation and reinforces it. As described by Mandelbaum,

It is impossible to isolate and objectively assess the contribution each [football] team member makes to the outcome of the play.... [E]very basketball player is interacting with all of his teammates all the time. In baseball, by contrast(SONY Vaio VGN-FW465J Battery), every player is more or less on his own.... Baseball is therefore a realm of complete transparency and total responsibility. A baseball player lives in a glass house, and in a stark moral universe.... Everything that every player does is accounted for and everything accounted for is either good or bad, right or wrong(SONY Vaio VGN-FW31M Battery).

Cricket is more similar to baseball than many other team sports in this regard: while the individual focus in cricket is mitigated by the importance of the batting partnership and the practicalities of tandem running, it is enhanced by the fact that a batsman may occupy the wicket for an hour or much more(SONY VAIO VGN-FZ21E Battery). There is no statistical equivalent in cricket for the fielding error and thus less emphasis on personal responsibility in this area of play.

Uniqueness of each baseball park

Unlike those of most sports, baseball playing fields can vary significantly in size and shape. While the dimensions of the infield are specifically regulated, the only constraint on outfield size and shape for professional teams following the rules of Major League and Minor League Baseball is that fields built or remodeled since June 1, 1958(SONY VAIO VGN-FZ21Z Battery), must have a minimum distance of 325 feet (99 m) from home plate to the fences in left and right field and 400 feet (122 m) to center. Major league teams often skirt even this rule. For example, at Minute Maid Park, which became the home of the Houston Astros in 2000(SONY VAIO VGN-FZ21J Battery), the Crawford Boxes in left field are only 315 feet (96 m) from home plate. There are no rules at all that address the height of fences or other structures at the edge of the outfield. The most famously idiosyncratic outfield boundary is the left-field wall at Boston's Fenway Park, in use since 1912(SONY Vaio VGN-FW11 Battery): the Green Monster is 310 feet (94 m) from home plate down the line and 37 feet (11 m) tall.

Fenway Park, home of the Boston Red Sox. The Green Monster is visible beyond the playing field on the left.

Similarly, there are no regulations at all concerning the dimensions of foul territory. Thus a foul fly ball may be entirely out of play in a park with little space between the foul lines and the stands, but a flyout in a park with more expansive foul ground(SONY Vaio VGN-FW11M Battery). A fence in foul territory that is close to the outfield line will tend to direct balls that strike it back toward the fielders, while one that is farther away may actually prompt more collisions, as outfielders run full speed to field balls deep in the corner. These variations can make the difference between a double and a triple or inside-the-park home run(SONY Vaio VGN-FW11S Battery). The surface of the field is also unregulated. While the image to the left shows a traditional field surfacing arrangement (and the one used by virtually all MLB teams with naturally surfaced fields), teams are free to decide what areas will be grassed or bare. Some fields—including several in MLB—use an artificial surface, such as AstroTurf(SONY Vaio VGN-FW21E Battery). Surface variations can have a significant effect on how ground balls behave and are fielded as well as on baserunning. Similarly, the presence of a roof (seven major league teams play in stadiums with permanent or retractable roofs) can greatly affect how fly balls are played(SONY Vaio VGN-FW21J Battery). While football and soccer players deal with similar variations of field surface and stadium covering, the size and shape of their fields are much more standardized. The area out-of-bounds on a football or soccer field does not affect play the way foul territory in baseball does, so variations in that regard are largely insignificant(SONY Vaio VGN-FW21L Battery).

These physical variations create a distinctive set of playing conditions at each ballpark. Other local factors, such as altitude and climate, can also significantly affect play. A given stadium may acquire a reputation as a pitcher's park or a hitter's park, if one or the other discipline notably benefits from its unique mix of elements(SONY Vaio VGN-FW21M Battery). The most exceptional park in this regard is Coors Field, home of the Colorado Rockies. Its high altitude—5,282 feet (1,610 m) above sea level—is responsible for giving it the strongest hitter's park effect in the major leagues. Wrigley Field, home of the Chicago Cubs, is known for its fickle disposition(SONY VGP-BPS13Q Battery): a hitter's park when the strong winds off Lake Michigan are blowing out, it becomes more of a pitcher's park when they are blowing in. The absence of a standardized field affects not only how particular games play out, but the nature of team rosters and players' statistical records(SONY VGP-BPS13B/Q Battery). For example, hitting a fly ball 330 feet (100 m) into right field might result in an easy catch on the warning track at one park, and a home run at another. A team that plays in a park with a relatively short right field, such as the New York Yankees(SONY VGN NR11S/S battery), will tend to stock its roster with left-handed pull hitters, who can best exploit it. On the individual level, a player who spends most of his career with a team that plays in a hitter's park will gain an advantage in batting statistics over time—even more so if his talents are especially suited to the park(SONY VGN NR11M/S battery).

Statistics

Organized baseball lends itself to statistics to a greater degree than many other sports. Each play is discrete and has a relatively small number of possible outcomes. In the late nineteenth century, a former cricket player, English-born Henry Chadwick of Brooklyn, New York(SONY VGN NR11Z/S battery), was responsible for the "development of the box score, tabular standings, the annual baseball guide, the batting average, and most of the common statistics and tables used to describe baseball." The statistical record is so central to the game's "historical essence" that Chadwick came to be known as Father Baseball(SONY VGN NR11Z/T battery). In the 1920s, American newspapers began devoting more and more attention to baseball statistics, initiating what journalist and historian Alan Schwarz describes as a "tectonic shift in sports, as intrigue that once focused mostly on teams began to go to individual players and their statistics lines(SONY VGP-BPS13A/Q Battery)."

The Official Baseball Rules administered by Major League Baseball require the official scorer to categorize each baseball play unambiguously. The rules provide detailed criteria to promote consistency. The score report is the official basis for both the box score of the game and the relevant statistical records(SONY Vaio PCG-F305 battery). General managers, managers, and baseball scouts use statistics to evaluate players and make strategic decisions.

Rickey Henderson—the major leagues' all-time leader in runs and stolen bases—stealing third base in a 1988 game.

Certain traditional statistics are familiar to most baseball fans. The basic batting statistics include(SONY VGP-BPS21/S Battery):

At bats: plate appearances, excluding walks and hit by pitches—where the batter's ability is not fully tested—and sacrifices and sacrifice flies—where the batter intentionally makes an out in order to advance one or more baserunners

Hits: times reached base because of a batted, fair ball without fielding error or fielder's choice(SONY VGP-BPS21 Battery)

Runs: times circling the bases and reaching home safely

Runs batted in (RBIs): number of runners who scored due to a batter's action (including the batter, in the case of a home run), except when batter grounded into double play or reached on an error(SONY VGP-BPS21B Battery)

Home runs: hits on which the batter successfully touched all four bases, without the contribution of a fielding error

Batting average: hits divided by at bats—the traditional measure of batting ability

The basic baserunning statistics include(SONY VGP-BPS21A/B Battery):

Stolen bases: times advancing to the next base entirely due to the runner's own efforts, generally while the pitcher is preparing to deliver or delivering the ball

Caught stealing: times tagged out while attempting to steal a base

Cy Young—the holder of many major league career marks, including wins and innings pitched, as well as losses—in 1908(SONY pcga-bp2ea battery). MLB's annual awards for the best pitcher in each league are named for Young.

The basic pitching statistics include:

Wins: credited to pitcher on winning team who last pitched before the team took a lead that it never relinquished (a starting pitcher must pitch at least five innings to qualify for a win) (SONY VAIO PCG-5K1L battery)

Losses: charged to pitcher on losing team who was pitching when the opposing team took a lead that it never relinquished

Saves: games where the pitcher enters a game led by the pitcher's team, finishes the game without surrendering the lead, is not the winning pitcher, and either (a) the lead was three runs or less when the pitcher entered the game(SONY VAIO PCG-6W2L battery); (b) the potential tying run was on base, at bat, or on deck; or (c) the pitcher pitched three or more innings

Innings pitched: outs recorded while pitching divided by three

Strikeouts: times pitching three strikes to a batter

Winning percentage: wins divided by decisions (wins plus losses)

Earned run average (ERA): runs allowed, excluding those resulting from fielding errors, per nine innings pitched(SONY VAIO PCG-7112L battery)

The basic fielding statistics include:

Putouts: times the fielder catches a fly ball, tags or forces out a runner, or otherwise directly effects an out

Assists: times a putout by another fielder was recorded following the fielder touching the ball

Errors: times the fielder fails to make a play that should have been made with common effort, and the batting team benefits as a result(SONY VAIO PCG-8Z1L battery)

Total chances: putouts plus assists plus errors

Fielding average: successful chances (putouts plus assists) divided by total chances

Among the many other statistics that are kept are those collectively known as situational statistics. For example, statistics can indicate which specific pitchers a certain batter performs best against(SONY VAIO PCG-8Z2L battery). If a given situation statistically favors a certain batter, the manager of the fielding team may be more likely to change pitchers or have the pitcher intentionally walk the batter in order to face one who is less likely to succeed.

Sabermetrics

Sabermetrics refers to the field of baseball statistical study and the development of new statistics and analytical tools(SONY VAIO PCG-8Y2L battery). The term is also used to refer directly to new statistics themselves. The term was coined around 1980 by one of the field's leading proponents, Bill James, and derives from the Society for American Baseball Research (SABR) (SONY VAIO PCG-8Y1L battery).

The growing popularity of sabermetrics since the early 1980s has brought more attention to two batting statistics that sabermetricians argue are much better gauges of a batter's skill than batting average(SONY VAIO PCG-7Z2L battery):

On-base percentage measures a batter's ability to get on base. It is calculated by taking the sum of the batter's successes in getting on base (hits plus walks plus hit by pitches) and dividing that by the batter's total plate appearances (at bats plus walks plus hit by pitches plus sacrifice flies), except for sacrifice bunts(SONY VAIO PCG-7Z1L battery).

Slugging percentage measures a batter's ability to hit for power. It is calculated by taking the batter's total bases (one per each single, two per double, three per triple, and four per home run) and dividing that by the batter's at bats.

Some of the new statistics devised by sabermetricians have gained wide use:

On-base plus slugging (OPS) measures a batter's overall ability. It is calculated by adding the batter's on-base percentage and slugging percentage(SONY VAIO PCG-7133L battery).

Walks plus hits per inning pitched (WHIP) measures a pitcher's ability at preventing hitters from reaching base. It is calculated exactly as its name suggests.

Popularity and cultural impact

Writing in 1919, philosopher Morris Raphael Cohen described baseball as America's national religion(SONY VAIO PCG-7113L battery). In the words of sports columnist Jayson Stark, baseball has long been "a unique paragon of American culture"—a status he sees as devastated by the steroid abuse scandal. Baseball has an important place in other national cultures as well: Scholar Peter Bjarkman describes "how deeply the sport is ingrained in the history and culture of a nation such as Cuba(SONY VAIO PCG-6W3L battery), how thoroughly it was radically reshaped and nativized in Japan." Since the early 1980s, the Dominican Republic, in particular the city of San Pedro de Macorís, has been the major leagues' primary source of foreign talent. Both the local winter league and major league ball are closely followed in Puerto Rico(SONY VAIO PCG-7111L battery); major league Hall-of-Famer Roberto Clemente remains one of the greatest national heroes in the island's history. In the Western Hemisphere, baseball is also one of the leading sports in Canada, Colombia, Mexico, the Netherlands Antilles, Nicaragua, Panama, and Venezuela(SONY VAIO PCG-6W1L battery). In Asia, it is among the most popular sports in South Korea and Taiwan.

The major league game in the United States was originally targeted toward a middle-class, white-collar audience: relative to other spectator pastimes, the National League's set ticket price of 50 cents in 1876 was high, while the location of playing fields outside the inner city and the workweek daytime scheduling of games were also obstacles to a blue-collar audience(SONY VAIO PCG-6V1L battery). A century later, the situation was very different. With the rise in popularity of other team sports with much higher average ticket prices—football, basketball, and hockey—professional baseball had become among the most blue-collar-oriented of leading American spectator sports(SONY VAIO PCG-6S3L battery).

In the late 1900s and early 2000s, baseball's position compared to football in the United States moved in contradictory directions. In 2008, Major League Baseball set a revenue record of $6.5 billion, matching the NFL's revenue for the first time in decades. A new MLB revenue record of $6.6 billion was set in 2009(SONY VAIO PCG-6S2L battery). On the other hand, the percentage of American sports fans polled who named baseball as their favorite sport was 16%, compared to pro football at 31%. In 1985, the respective figures were pro football 24%, baseball 23%. Because there are so many more major league baseball games played(SONY VAIO PCG-5J2L battery), there is no comparison in overall attendance. In 2008, total attendance at major league games was the second-highest in history: 78.6 million, 0.7% off the record set the previous year. The following year, amid the U.S. recession, attendance fell by 6.6% to 73.4 million. Attendance at games held under the Minor League Baseball umbrella also set a record in 2007, with 42.8 million(SONY VAIO PCG-5L1L battery); this figure does not include attendance at games of the several independent minor leagues.

Two players on the baseball team of Tokyo, Japan's Waseda University in 1921

In Japan, where baseball is inarguably the leading spectator team sport, combined revenue for the twelve teams in Nippon Professional Baseball (NPB), the body that oversees both the Central and Pacific leagues(SONY VAIO PCG-5K2L battery), was estimated at $1 billion in 2007. Total NPB attendance for the year was approximately 20 million. While in the preceding two decades, MLB attendance grew by 50 percent and revenue nearly tripled, the comparable NPB figures were stagnant. There are concerns that MLB's growing interest in acquiring star Japanese players will hurt the game in their home country(SONY VAIO PCG-5J1L battery). In Cuba, where baseball is by every reckoning the national sport, the national team overshadows the city and provincial teams that play in the top-level domestic leagues. Revenue figures are not released for the country's amateur system. Similarly, according to one official pronouncement(SONY VAIO PCG-5G3L battery), the sport's governing authority "has never taken into account attendance ... because its greatest interest has always been the development of athletes".

As of 2007, Little League Baseball oversees more than 7,000 children's baseball leagues with more than 2.2 million participants—2.1 million in the United States and 123,000 in other countries(SONY VAIO PCG-5G2L battery). Babe Ruth League teams have over 1 million participants. According to the president of the International Baseball Federation, between 300,000 and 500,000 women and girls play baseball around the world, including Little League and the introductory game of Tee Ball(SONY VGP-BPS13B/S Battery).

A varsity baseball team is an established part of physical education departments at most high schools and colleges in the United States. In 2008, nearly half a million high schoolers and over 35,000 collegians played on their schools' baseball teams. The number of Americans participating in baseball has declined since the late 1980s(SONY VGP-BPS13S Battery), falling well behind the number of soccer participants. By early in the 20th century, intercollegiate baseball was Japan's leading sport. Today, high school baseball in particular is immensely popular there. The final rounds of the two annual tournaments—the National High School Baseball Invitational Tournament in the spring(SONY VGP-BPS13AS Battery), and the even more important National High School Baseball Championship in the summer—are broadcast around the country. The tournaments are known, respectively, as Spring Koshien and Summer Koshien after the 55,000-capacity stadium where they are played(SONY VGP-BPS13A/S Battery). In Cuba, baseball is a mandatory part of the state system of physical education, which begins at age six. Talented children as young as seven are sent to special district schools for more intensive training—the first step on a ladder whose acme is the national baseball team(Sony VAIO VGN-FZ15G Battery).

Baseball in popular culture

Baseball has had a broad impact on popular culture, both in the United States and elsewhere. Dozens of English-language idioms have been derived from baseball; in particular, the game is the source of a number of widely used sexual euphemisms. The first networked radio broadcasts in North America were of the 1922 World Series(Sony VAIO VGN-FZ15T Battery): famed sportswriter Grantland Rice announced play-by-play from New York City's Polo Grounds on WJZ–Newark, New Jersey, which was connected by wire to WGY–Schenectady, New York, and WBZ–Springfield, Massachusetts. The baseball cap has become a ubiquitous fashion item not only in the United States and Japan(SONY VGP-BPS13/B Battery), but also in countries where the sport itself is not particularly popular, such as the United Kingdom.

The American Tobacco Company's line of baseball cards featured shortstop Honus Wagner of the Pittsburgh Pirates from 1909 to 1911. In 2007, the card shown here sold for $2.8 million(Dell N3010 Battery).

Baseball has inspired many works of art and entertainment. One of the first major examples, Ernest Thayer's poem "Casey at the Bat", appeared in 1888. A wry description of the failure of a star player in what would now be called a "clutch situation", the poem became the source of vaudeville and other staged performances(Dell INSPIRON 1764 battery), audio recordings, film adaptations, and an opera, as well as a host of sequels and parodies in various media. There have been many baseball movies, including the Academy Award–winning The Pride of the Yankees (1942) and the Oscar nominees The Natural (1984) and Field of Dreams (1989) (Dell INSPIRON 1564 battery). The American Film Institute's selection of the ten best sports movies includes The Pride of the Yankees at number 3 and Bull Durham (1988) at number 5. Baseball has provided thematic material for hits on both stage—the Adler–Ross musical Damn Yankees—and record—George J. Gaskin's "Slide(Dell INSPIRON 1464 battery), Kelly, Slide", Simon and Garfunkel's "Mrs. Robinson", and John Fogerty's Centerfield. The baseball-founded comedic sketch "Who's on First", introduced by Abbott and Costello in 1938, quickly became famous. Six decades later, Time named it the best comedy routine of the twentieth century(Dell INSPIRON 1520 battery).

The game's rich literary tradition includes the short fiction of Ring Lardner and novels such as Bernard Malamud's The Natural (the source for the movie), Robert Coover's The Universal Baseball Association, Inc., J. Henry Waugh, Prop., and W. P. Kinsella's Shoeless Joe (the source for Field of Dreams) (Dell INSPIRON 1420 battery). Baseball's literary canon also includes the beat reportage of Damon Runyon; the columns of Grantland Rice, Red Smith, Dick Young, and Peter Gammons; and the essays of Roger Angell. Among the celebrated nonfiction books in the field are Lawrence S. Ritter's The Glory of Their Times(Dell INSPIRON E1505 battery), Roger Kahn's The Boys of Summer, and Michael Lewis's Moneyball. The 1970 publication of major league pitcher Jim Bouton's tell-all chronicle Ball Four is considered a turning point in the reporting of professional sports.

Baseball has also inspired the creation of new cultural forms. Baseball cards were introduced in the late nineteenth century as trade cards(Dell INSPIRON 1525 battery). A typical example would feature an image of a baseball player on one side and advertising for a business on the other. In the early 1900s they were produced widely as promotional items by tobacco and confectionery companies. The 1930s saw the popularization of the modern style of baseball card(ASUS EEE PC900 battery), with a player photograph accompanied on the rear by statistics and biographical data. Baseball cards—many of which are now prized collectibles—are the source of the much broader trading card industry, involving similar products for different sports and non-sports-related fields(ASUS EEE PC battery).

Modern fantasy sports began in 1980 with the invention of Rotisserie League Baseball by New York writer Daniel Okrent and several friends. Participants in a Rotisserie league draft notional teams from the list of active Major League Baseball players and play out an entire imaginary season with game outcomes based on the players' latest real-world statistics(SONY VGP-BPS13B/B Battery). Rotisserie-style play quickly became a phenomenon. Now known more generically as fantasy baseball, it has inspired similar games based on an array of different sports. The field boomed with increasing Internet access and new fantasy sports–related websites(SONY VGP-BPS13 Battery). By 2008, 29.9 million people in the United States and Canada were playing fantasy sports, spending $800 million on the hobby. The burgeoning popularity of fantasy baseball is also credited with the increasing attention paid to sabermetrics—first among fans, only later among baseball professionals(HP PAVILION DV6000 battery).

Tuesday, May 17, 2011

Knowledge of Tank

A tank is a tracked, armoured fighting vehicle designed for front-line combat which combines operational mobility, tactical offensive, and defensive capabilities. Firepower is normally provided by a large-calibre main gun in a rotating turret and secondary machine guns(AKKU Sony VGP-BPS13), while heavy armour and all-terrain mobility provide protection for the tank and its crew, allowing it to perform all primary tasks of the armoured troops on the battlefield.

Tanks were developed and first used in combat by the British during World War I as a means to break the deadlock of trench warfare(AKKU Sony VGP-BPS13A/B). They were first deployed at the Battle of Somme in limited numbers. During construction, to conceal their true identity as weapons, they were designated as water carriers for the Mesopotamian campaign and referred to as "tanks" (as in "water tank"). However, there are two other proposed etymologies – these are discussed in the Etymology section below(AKKU Sony VGP-BPS13B/B).

Interwar developments in both design and tactics evolved during World War II, producing important concepts of armoured warfare which persist to this day and were prominently displayed during World War II. The Soviet Union introduced the T-34, one of the best tanks in service throughout the war(AKKU Sony VGP-BPS13/S). Germany introduced blitzkrieg, a strategy which makes use of massed concentrations of tanks supported by artillery and air power to break through the enemy front and cause a complete collapse in enemy resistance(AKKU Sony VGP-BPS13B/S).

Tanks in the Cold War advanced to counter greater battlefield threats. Tanks became larger and their armour became thicker and much more effective. Advances in manufacturing late in the war allowed the mass production of composite armor. Aspects of gun technology changed significantly as well, with advances in shell design(AKKU Sony VGP-BPS13A/S).

Today, main battle tanks are considered a key component of modern armies. Modern tanks seldom operate alone, as they are organized into armoured units which involve the support of infantry, who may accompany the tanks in infantry fighting vehicles. They are also usually supported by reconnaissance or ground-attack aircraft(AKKU Sony VGP-BPS13A/Q).

History

Conception

Film clip of tanks in Langres, France, during the First World War (1918)

Apart from Leonardo da Vinci's drawing of a round, tank-like armoured wagon, the first description of a tank-like vehicle and its usefulness in trench warfare is found in an H.G. Wells short story, "The Land Ironclads", in the Strand Magazine, December 1903(AKKU Sony VGP-BPS13B/Q). The concept of the tank is implicit, however, in two letters published in 1833 in The London United Service Magazine. In the first (January 1833) "A Constant Reader" wrote from Bombay to propose the creation of "Steam Chariots of War": "The great forte of steam is its passiveness(AKKU Sony VGP-BPS13Q). Secure the boiler and the machinery from the stroke of a cannon-ball, and you might drive a steam-chariot triumphantly through a regiment. Imagine three or four of these machines driven at a galloping speed through a square of infantry(Sony VGP-BPL8 Battery); the director might be seated in perfect safety in the rear of the engine, and a body of cavalry, about fifty yards in rear, would enter the furrows ploughed by these formidable chariots, and give the coup-de-grace to the unfortunate infantry. The chariots might be armed with scythes, both in front and flank(Sony VGP-BPL8A Battery); and, if the first shock were avoided by the men opening their ranks, they might easily be made sufficiently manageable to wheel round and return on any part of the square which stood firm" (118). In the second letter (May 1833), a correspondent identified only as "C." discussed the "Application of Steam to Engines of War," advocating the construction of "Chariots of Iron"—"locomotive engines" covered in "proof iron plate" and capable of running "upon ordinary roads"—for use in battle (118) (Sony VGN-FZ130E/B Battery).

Joseph Hawker is attributed as being the father of the modern tank when in 1872, Hawker took out a patent for: 'propelling a road locomotive employing endless flat linked pitch or other chains passing round the rims of the main moving wheels(Sony VGN-FZ130E/BA Battery).' The details of his patent reveal clearly the influence his idea had on the whole concept of crawler tractors and tanks employing drive and clutch steering. In 1903, the Levavasseur project describes a caterpillar-based armoured vehicle, and some eight years later(Sony VGN-FZ130E/BB Battery), in 1911, two practical tank designs were developed independently by Austrian engineering officer Günther Burstyn and Australian civil engineer Lancelot de Mole, but all were rejected by governmental administrations(Sony VGP-BPL9 Akku).

In Russia Vassily Mendeleev, son of the renowned chemist Dimitri Mendeleev designed in 1911-15 a caterpillar-tracked armoured fighting vehicle for the Tsarist army. It was surprisingly sophisticated for its time, with pneumatic suspension, a revolving turret and a static mode, which allowed it to sink downwards from its tracks and park - presumably when carrying out prolonged bombardment(Sony VGP-BPL9/B Akku). The tank itself, however, was impractical in several ways. It was perfectly cuboid in shape, very large and unwieldy, and had long track-links which would have severely limited speed and manoeuvrability(Sony VGP-BPL9/S Akku). Due to a lack of industrial capacity, and doubts about the project, the war office never ordered for it to be built. Nonetheless, Mendeleev's designs still exist, with detailed schematics showing his ambitions(Sony VGP-BPL9A/B Akku).

Burstyn designed his tank with a sprung suspension and armed with a single gun located in a revolving turret—a design quite similar to modern tanks—but he lacked funding to work out all the design issues and develop a prototype, as neither the Austro-Hungarian nor Imperial German War Ministries were interested(Sony VGP-BPL9A Akku). He submitted his idea of a "land torpedo boat" to the Military Technical Committee in Vienna but the idea was rejected owing to an inability to foresee the use for such an innovation and unwillingness to fund a prototype and test regime at the expense of the Army's administration; he did, however, manage to patent his invention (Sony VGP-BPL9 Akku) (Zl. 252 815 DRP).

Around the same time, de Mole designed "a tracked armoured vehicle" and sent his sketches to the British War Office. His idea was rejected, but after the Great War the Royal Commission awarded de Mole £965 (about £33,000 today) for expenses, and in 1920 he was appointed C.B.E(Sony VGP-BPS21 Akku).

World War I

On 20 February 1915, the Landship Committee of the Admiralty was formed on the orders of the First Lord of the Admiralty, Winston Churchill, The chief constructor for the Royal Navy, Eustace Tennyson-d'Eyncourt, headed the board of naval architects which formed the basis of the Landship Committee(Sony VGP-BPS21A Akku). Although there were many inventors, writers, and military men that have been credited with being the inventor of the tank, none of them possessed the initiation and sustaining actions required to actually produce a standard issue military tank(Sony VGP-BPS21B Akku). In January 1916, the Landship Committee under the leadership of Tennyson-d'Eyncourt had overseen the production of man's first standard issue military tank, the "Mother Tank"; this Mark Series of "Male" (cannon armed) and "Female" (machinegun armed) tanks would go on to fight in history's first tank action at the Somme in August 1916(Sony VGP-BPS21A/B Akku).

The next tank to engage in battle was designated D1, a British Mark I, during the Battle of Flers-Courcellette on 15 September 1916.

Renault FT-17 tanks, here operated by the US army, pioneered the use of a fully traversable turret and served as pattern for most modern tanks(Sony VGP-BPS21/S Akku).

In contrast to World War II, Germany fielded very few tanks during World War I, with only 15 of the A7V type being produced in Germany during the war. The first tank versus tank action took place on 24 April 1918 at Villers-Bretonneux, France, when three British Mark IVs met three German A7Vs(Akku Sony VGP-BPL14). Though the encounter revealed serious flaws in tank design and doctrine for both sides, the British prevailed.

Under the influence of Colonel Jean-Baptiste Eugène Estienne the French pioneered the use of a full 360º rotation, fully traversable, turret in a tank for the first time in 1917(Akku Sony VGP-BPS14/S ), with the creation and deployment of the Renault FT-17 light tank, with the turret containing the tank's main armament. Aside of the traversable turret another innovative feature of the FT-17 was about its engine located on the back on the tank rather than the front. This pattern(Akku Sony VGP-BPL14/B), with the gun located on a mounted turret and with the engine on the back, became the standard for most succeeding tanks across the world even to this day (with some exception like modern Israeli tanks where the engine is on the front) (Akku Sony VGP-BPS14/B ).

Mechanical problems, poor mobility and piecemeal tactical deployment limited the military significance of the tank in World War I, and the tank did not fulfill its promise of rendering trench warfare obsolete. Nonetheless, it was clear to military thinkers on both sides that tanks would play a significant role in future conflicts(AKKU sony VAIO VGN-FW21E).

Interwar period

In the interwar period tanks underwent further mechanical development. In terms of tactics, J.F.C. Fuller's doctrine of spearhead attacks with massed tank formations was the basis for work by Heinz Guderian in Germany, Percy Hobart in Britain, Adna R. Chaffee, Jr., in the U.S., Charles de Gaulle in France(AKKU Sony VAIO VGN-FW21I), and Mikhail Tukhachevsky in the USSR. All came to similar conclusions, but in the Second World War only Germany would initially put the theory into practice on a large scale, and it was their superior tactics and French blunders, not superior weapons, that made blitzkrieg so successful in May 1940(AKKU Sony VAIO VGN-FW21L). For information regarding tank development in this period, see tank development between the wars.

Germany, Italy and the Soviet Union all experimented heavily with tank warfare during their clandestine and “volunteer” involvement in the Spanish Civil War(AKKU Sony VAIO VGN-FW21Z), which saw some of the earliest examples of successful mechanised combined arms—such as when Republican troops, equipped with Soviet-supplied medium tanks and supported by aircraft, eventually routed Italian troops fighting for the Nationalists in the seven-day Battle of Guadalajara in 1937(AKKU Sony VAIO VGN-FW21M).

World War II

World War II was the first conflict where armoured vehicles were critical to success on the battlefield and in this period the tank developed rapidly as a weapon system. It showed how an armoured force was capable of achieving a tactical victory in an unprecedentedly short amount of time. At the same time however(AKKU Sony VAIO VGN-FW31M), the development of effective anti-tank weaponry demonstrated that the tank was not invulnerable.

Prior to World War II the tactics and strategy of deploying tank forces underwent a revolution. Heinz Guderian, a tactical theoretician who was heavily involved in the formation of the first independent German tank force(AKKU Sony VAIO VGN-FW31J), said "Where tanks are, the front is", and this concept became a reality in World War II. Following the Invasion of Poland where tanks performed in a more traditional role in close cooperation with infantry units, in the Battle of France deep independent armoured strategic penetrations were executed by the Germans(AKKU Sony VAIO VGN-FW31E), a tactic later called blitzkrieg or 'lightning war'. Blitzkrieg made use of innovative combined arms tactics and radios in all of the tanks to provide a level of tactical flexibility and power that surpassed that of the Allied armour(AKKU Sony VAIO VGN-FW31Z). The French Army, with tanks equal or superior to the German tanks in both quality and quantity, employed a linear defensive strategy in which the armoured cavalry units were made subservient to infantry as "support weapons"(AKKU Sony VAIO VGN-FW31ZJ). In addition, they lacked radios in many of their tanks and headquarters, which limited their ability to respond to German attacks.

In accordance with blitzkrieg tactics, German tanks bypassed enemy strongpoints and could radio for close air support to destroy them, or leave them to the infantry. A related development, motorized infantry(AKKU Sony VAIO VGN-FW32Z), allowed some of the troops to keep up with the tanks and create highly mobile combined arms forces. The defeat of a major military power within weeks shocked the rest of the world, resulting in an increased focus on tank and anti-tank weapon development(AKKU Sony VAIO PCG-5G2L).

Rommel in North Africa, June 1942

The North African Campaign also provided an important battleground for tanks, as the flat, desolate terrain with relatively few obstacles or urban environments was ideal for conducting mobile armoured warfare(AKKU Sony VAIO PCG-5G3L ). However, this battlefield also showed the importance of logistics, especially in an armoured force, as the principal warring armies, the German Afrika Korps and the British Eighth Army, often outpaced their supply trains in repeated attacks and counter-attacks on each other, resulting in complete stalemate(Sony VAIO PCG-5J1L Akku). This situation would not be resolved until 1942, when during the Second Battle of El Alamein, the Afrika Korps, crippled by disruptions in their supply lines, was forced to retreat by a massively reinforced Eighth Army, the first in a series of defeats that would eventually lead to the surrender of the remaining Axis forces in Tunisia(Sony VAIO PCG-5J2L Akku).

Soviet T-34 tank column advancing near Leningrad, 1942

The German invasion of the Soviet Union, Operation Barbarossa, started with the Soviets having a superior tank design, the T-34. A lack of preparations for the Axis surprise attack, mechanical problems, poor training of the crews and incompetent leadership caused the Soviet machines to be surrounded and destroyed in large numbers(Sony VAIO PCG-5K2L Akku). However, interference from Adolf Hitler, the geographic scale of the conflict, the dogged resistance of the Soviet combat troops, and Soviet manpower and production capability prevented a repeat of the blitzkrieg of 1940. Despite early successes against the Soviets, the Germans were forced to up-gun their Panzer IVs(Sony VAIO PCG-5K1L Akku), and to design and build larger and more expensive Panther and Tiger tanks. In doing so, the Wehrmacht denied the infantry and other support arms the production priorities that they needed to remain equal partners with the increasingly sophisticated tanks, in turn violating the principle of combined arms they had pioneered(Sony VAIO PCG-6S1L Akku). Soviet developments following the invasion included upgunning the T-34, development of self-propelled anti-tank guns such as the SU-152, and deployment of the IS-2 in the closing stages of the war.

Sherman tanks joining the U.S. Fifth Army forces in the beachhead at Anzio during the Italian Campaign, 1944(Sony VAIO PCG-6S2L Akku)

When entering World War II, America's mass production capacity enabled her to rapidly construct thousands of relatively cheap M4 Medium tanks. A compromise all round, the Sherman was reliable and formed a large part of the Anglo-American ground forces, but in a tank-versus-tank battle was no match for the Panther or Tiger(Sony VAIO PCG-6W1L Akku). Numerical and logistical superiority and the successful use of combined arms allowed the Allies to overrun the German forces during the Battle of Normandy. Upgunned versions with the 76 mm gun M1 and the 17 pounder were introduced to improve the M4's firepower, but concerns about protection remained(Sony VAIO PCG-6W2L Akku).

Tank chassis were modified to produce flame tanks, mobile rocket artillery, and combat engineering vehicles for tasks including mine-clearing and bridging. Specialised self-propelled guns were also developed: tank destroyers and assault guns were cheap, stripped down tanks carrying heavy guns(Sony VAIO PCG-6W3L Akku), often in a fixed hull mounting. The firepower and low cost of these vehicles made them attractive but as manufacturing techniques improved and larger turret rings made larger tank guns feasible, the gun turret was recognised as the most effective mounting for the main gun to allow movement in a different direction from firing, enhancing tactical flexibility(Sony VAIO PCG-7111L Akku).

The Cold War arms race

During the Cold War, tension between the Warsaw Pact countries and North Atlantic Treaty Organisation (NATO) countries created an arms race that ensured that tank development proceeded largely as it had during World War II(Sony VAIO PCG-7112L Akku). The essence of tank designs during the Cold War had been hammered out in the closing stages of World War II. Large turrets, capable suspension systems, greatly improved engines, sloped armour and large-calibre (90 mm and larger) guns were standard(Sony VAIO PCG-7113L Akku). Tank design during the Cold War built on this foundation and included improvements to fire control, gyroscopic gun stabilisation, communications (primarily radio) and crew comfort and saw the introduction of laser rangefinders and infrared night vision equipment(Sony VAIO PCG-7131L Akku). Armour technology progressed in an ongoing race against improvements in anti-tank weapons, especially antitank guided missiles like the TOW.

Medium tanks of World War II, evolved into the main battle tank (MBT) of the Cold War and took over the majority of tank roles on the battlefield. This gradual transition occurred in the 1950s and 1960s due to anti-tank guided missiles(Sony VAIO PCG-7132L Akku), sabot ammunition and high explosive anti-tank warheads. World War II had shown that the speed of a light tank was no substitute for armour and firepower and heavy tanks were as vulnerable as medium tanks to newer weapon technology, rendering them obsolete(Sony VAIO PCG-7133L Akku).

In a trend started in World War II, economies of scale led to serial production of progressively upgraded models of all major tanks during the Cold War. For the same reason many upgraded post–World War II tanks and their derivatives (for example, the T-55 and T-72) remain in active service around the world(Sony VAIO PCG-7z1L Akku), and even an obsolete tank may be the most formidable weapon on battlefields in many parts of the world. Among the tanks of the 1950s were the British Centurion and Soviet T-54/55 in service from 1946, and the US M48 from 1951. These three vehicles formed the bulk of the armoured forces of NATO and the Warsaw Pact throughout much of the Cold War. Lessons learned from tanks such as the Leopard 1(Sony VAIO PCG-7z1L Akku), M48 Patton series, Chieftain, and T-72 led to the contemporary Leopard 2, M1 Abrams, Challenger 2, C1 Ariete, T-90 and Merkava IV.

Tanks and anti-tank weapons of the Cold War era saw action in a number of proxy wars like the Korean War, Vietnam War, Indo-Pakistani War of 1971, Soviet war in Afghanistan and Arab-Israeli conflicts(Sony VAIO PCG-8Y1L Akku), culminating with the Yom Kippur War. The T-55, for example, has seen action in no fewer than 32 conflicts. In these wars the USA or NATO countries and the Soviet Union or China consistently backed opposing forces. Proxy wars were studied by Western and Soviet military analysts and provided a grim contribution to the Cold War tank development process(Sony VAIO PCG-8Y2L Akku).

Present

Type 10 Japanese main battle tank

The role of tank vs. tank combat is becoming diminished. Tanks work in concert with infantry in urban warfare by deploying them ahead of the platoon. When the infantry are engaged, tanks employ covering fire on the enemy while the infantry take cover. Contrastedly, tanks spearhead attacks when infantry are employed in personnel carriers(Sony VAIO PCG-8Z1L Akku).

Tanks were used to spearhead the initial invasion of Iraq. As of 2005, there were 1,100 M1 Abrams used by the United States Army in the course of the Iraq War, and they have proven to have an unexpectedly high level of vulnerability to roadside bombs. A relatively new type of remotely detonated mine(Sony VAIO PCG-8Z2L Akku), the explosively formed penetrator has been used with some success against American armoured vehicles (particularly the Bradley fighting vehicle). However, with upgrades to their armour in the rear, M1s have proven invaluable in fighting insurgents in urban combat(Akku Sony VGN-NR11M/S), particularly at the Battle of Fallujah, where the Marines brought in two extra brigades. Britain deployed its Challenger 2 tanks to support its operations in southern Iraq.

Research and development

Graphic representation of the US Army's cancelled XM1202 Mounted Combat System

In terms of firepower(Akku Sony VGN-NR11S/S), the focus of current R&D is on increased detection capability such as thermal imagers, automated fire control systems and increased muzzle energy from the gun to improve range, accuracy and armour penetration(Akku Sony VGN-NR11Z/S). The most mature future gun technology is the electrothermal-chemical gun. The XM291 electrothermal-chemical tank gun has gone through successful multiple firing sequences on a modified M8 Armored Gun System chassis.

To improve tank protection, one field of research involves making the tank invisible to radar by adapting stealth technologies originally designed for aircraft(Akku Sony VGN-NR11Z/T). Improvements to camouflage or and attempts to render it invisible through active camouflage is being pursued. Research is also ongoing in electromagnetic armour systems to disperse or deflect incoming shaped charge jets, as well as various forms of active protection systems to prevent incoming projectiles from striking the tank at all(Sony VAIO VGN-FZ11E Battery).

Mobility may be enhanced in future tanks by the use of diesel-electric or turbine-electric series hybrid drives improving fuel efficiency while reducing the size and weight of the power plant. Furthermore, advances in gas turbine technology, including the use of advanced recuperators(Akku Sony VAIO VGN-FZ11L), have allowed for reduction in engine volume and mass to less than 1 m3 and 1 metric ton, respectively, while maintaining fuel efficiency similar to that of a diesel engine.

In line with the new doctrine of network-centric warfare, the modern battle tank shows increasing sophistication in its electronics and communication systems(Akku Sony VAIO VGN-FZ11M).

Design

The three traditional factors determining a tank's capability effectiveness are its firepower, protection, and mobility. Firepower is the ability of a tank's crew to identify, engage, and destroy the enemy. Protection is the tank crew's ability to evade detection, preserve themselves from enemy fire(Akku Sony VAIO VGN-FZ11S), and retain full vehicle functionality after combat. Mobility includes the ability of the tank to be transported by rail, sea, or air to the operational staging area; from the staging area by road towards the enemy; and tactical movement over the battlefield during combat, including traversing of obstacles and rough terrain(Akku Sony VAIO VGN-FZ11Z).

Tank design is a compromise between its technological and budgetary constraints and its tactical capability requirements. It is not possible to maximise firepower, protection and mobility simultaneously while incorporating the latest technology and retain affordability for sufficient procurement quantity to enter production(Akku Sony VAIO VGN-FZ130E/B). For example, in the case of tactical capability requirements, increasing protection by adding armour will result in an increase in weight and therefore decrease in mobility; increasing firepower by installing a larger gun will force the designer team to increase armour(Akku Sony VAIO VGN-FZ140E), the therefore weight of the tank by retaining same internal volume to ensure crew efficiency during combat. In the case of the Abrams MBT which has good firepower, speed and armour, these advantages are counterbalanced by its engine's notably high fuel consumption, which ultimately reduces its range, and in a larger sense its mobility(Akku Sony VAIO VGN-FZ21E).

Since the Second World War, the economics of tank production governed by the complexity of manufacture and cost, and the impact of a given tank design on logistics and field maintenance capabilities, have also been accepted as important in determining how many tanks a nation can afford to field in its force structure(Akku Sony VAIO VGN-FZ21J).

Some tank designs that were fielded in significant numbers, such as Tiger I and M60A2 proved to be too complex or expensive to manufacture, and made unsustainable demands on the logistics services support of the armed forces. The affordability of the design therefore takes precedence over the combat capability requirements(Akku Sony VAIO VGN-FZ21M). Nowhere was this principle illustrated better than during the Second World War when two Allied designs, the T-34 and the M4 Sherman, although both simple designs which accepted engineering compromises, were used successfully against more sophisticated designs by Germany that were more complex and expensive to produce, and more demanding on overstretched logistics of the Wehrmacht(Akku Sony VAIO VGN-FZ21S). Given that a tank crew will spend most of its time occupied with maintenance of the vehicle, engineering simplicity has become the primary constraint on tank design since the Second World War despite advances in mechanical, electrical and electronics technologies(Akku Sony VAIO VGN-FZ21Z).

Since the Second World War, tank development has incorporated experimenting with significant mechanical changes to the tank design while focusing on technological advances in the tank's ubiquitous subsystems to improve its performance. However, a number of novel designs have appeared throughout this period with mixed success(Akku Sony VAIO VGN-FZ38M), including the Soviet IT-1 and T-64 in firepower, and the Israeli Merkava and Swedish S-tank in protection, while for decades the USA's M551 remained the only light tank deployable by parachute.

Tank design engineering

A noted author on the subject of tank design engineering Richard M Ogorkiewicz outlined the following basic engineering sub-systems that are commonly incorporated into tank's technological development(Akku Sony VAIO VGN-FZ31E):

Mobility of tanks (through chassis design)

Tank Engines

Tank Transmissions

Suspensions and Running gear

Soil-Vehicle Mechanics

Tank guns and Ammunition

Ballistics and Mechanics of Tank Guns

Vision and Sighting Systems

Illuminating and Night Vision Systems

Fire Control Systems for main and auxiliary weapons

Gun Control Systems(Akku Sony VAIO VGN-FZ31J)

Guided Weapons

Armour Protection

Configuration of Tanks

To the above can be added unit communication systems and electronic anti-tank countermeasures, crew ergonomic and survival systems (including flame suppression), and provision for technological upgrading(Akku Sony VAIO VGN-FZ31M). Most tank designs have rarely survived their entire service life without some upgrading or modernisation, particularly during wartime, including some that changed almost beyond recognition, such as the latest Israeli Magach versions(Sony Vaio VGN-FZ battery).

The characteristics of a tank are determined by the performance criteria required for the tank. The obstacles that must be traversed affect the vehicles front and rear profiles. The terrain that is expected to be traversed determines the track ground pressure that may be allowed to be exerted for that particular terrain(Sony Vaio VGN-FZ31M battery).

Offensive capabilities

The main weapon of all modern tanks is a single, large-calibre gun mounted in a fully traversing turret weapon mount. The typical tank gun is a smoothbore weapon capable of firing armor-piercing kinetic energy penetrators (KEP), also known as armour-piercing discarding sabot (APDS) (Sony Vaio VGN-FZ31Z battery), and/or armour piercing fin stabilised discarding sabot (APFSDS) and high explosive anti-tank (HEAT) shells, and/or high explosive squash head (HESH) and/or anti-tank guided missiles (ATGM) to destroy armoured targets, as well as high explosive (HE) shells for engaging soft targets or fortifications(Sony VGN-FZ19VN battery). Canister shot may be used in close or urban combat situations where the risk of hitting friendly forces with shrapnel from HE rounds is unacceptably high.

A gyroscope is used to stabilise the main gun, allowing it to be effectively aimed and fired at the "short halt" or on the move. Modern tank guns are also commonly fitted with insulating thermal jackets to reduce gun-barrel warping caused by uneven thermal expansion(Sony Vaio VGN-FZ38M battery), bore evacuators to minimise fumes entering the crew compartment and sometimes muzzle brakes to minimise the effect of recoil on accuracy and rate of fire.

Traditionally, target detection relied on visual identification. This was accomplished from within the tank through telescopic periscopes; occasionally however, tank commanders would open up the hatch to view the outside surroundings(Sony Vaio VGN-FZ31S battery), which improved situational awareness but incurred the penalty of vulnerability to sniper fire, especially in jungle and urban conditions. Though several developments in target detection have taken place especially recently, these methods are still common practice(Sony VGN-FZ11L battery).

In some cases spotting rifles were used confirm proper trajectory and range to a target. These spotting rifles were mounted co-axially to the main gun, and fired tracer ammunition ballistically matched to the gun itself. The gunner would track the movement of the tracer round in flight(Sony VGN-FZ15G battery), and upon impact with a hard surface, it would give off a flash and a puff of smoke, after which the main gun was immediately fired. However these have been mostly superseded by laser rangefinding equipment.

Modern tanks also use sophisticated light intensification and thermal imaging equipment to improve fighting capability at night(Sony VGP-BPS9/B battery), in poor weather and in smoke. The accuracy of modern tank guns is pushed to the mechanical limit by computerised fire-control systems. A fire-control system uses a laser rangefinder to determine the range to the target, a thermocouple(Sony VGN-FZ190 battery), anemometer and wind vane to correct for weather effects and a muzzle referencing system to correct for gun-barrel temperature, warping and wear. Two sightings of a target with the range-finder enable calculation of the target movement vector(Sony VGN-FZ190E battery). This information is combined with the known movement of the tank and the principles of ballistics to calculate the elevation and aim point that maximises the probability of hitting the target.

Usually, tanks carry smaller calibre armament for short-range defence where fire from the main weapon would be ineffective(Sony VGN-FZ18 battery), for example when engaging infantry, light vehicles or aircraft. A typical complement of secondary weapons is a general-purpose machine gun mounted coaxially with the main gun, and a heavier anti-aircraft machine gun on the turret roof(Sony Vaio VGN-FZ21E battery ). These weapons are often modified variants of those used by infantry, and so utilise the same kinds of ammunition.

At the Battle of Kursk a Tiger I commanded by Michael Wittmann survived a ramming by a T-34. Whittmann's driver was able to back away from the T-34 which was destroyed when its ammunition exploded(Sony Vaio VGN-FZ21S battery).

Countermeasures

The measure of a tank's protection is the combination of its ability to avoid detection, to avoid being hit by enemy fire, its resistance to the effects of enemy fire, and its capacity to sustain damage whilst still completing its objective, or at least protecting its crew. In common with most unit types(Sony VGN-FZ230E battery), tanks are subject to additional hazards in wooded and urban combat environments which largely negate the advantages of the tank's long-range firepower and mobility, limit the crew's detection capabilities and can restrict turret traverse. Despite these disadvantages, tanks retain high survivability against previous-generation rocket-propelled grenades in all combat environments by virtue of their armour(Sony Vaio VGN-FZ210CE battery).

However, as effective and advanced as armour plating has become, tank survivability against newer-generation (1980s) tandem-warhead anti-tank missiles is a concern for military planners. For example, the RPG-29 is able to penetrate the thickest frontal hull armour of the Challenger II and also managed to damage a M1 Abrams(Sony Vaio VGN-FZ18S battery).

Avoiding detection

A tank avoids detection using the doctrine of CCD: camouflage (looks the same as the surroundings), concealment (cannot be seen) and deception (looks like something else).

Working against efforts to avoid detection is the fact that a tank is a large metallic object with a distinctive, angular silhouette that emits copious heat and noise(Sony VGN-FW11 battery). Consequently, it is difficult to effectively camouflage a hull-up tank in the absence of some form of cover or concealment (e.g., woods). The tank becomes easier to detect when moving (typically, whenever it is in use) due to the large, distinctive auditory, vibration and thermal signature of its power plant(Sony VGN-FW11M battery). Tank tracks and dust clouds also betray past or present tank movement. Switched-off tanks are vulnerable to infra-red detection due to differences between the thermal conductivity and therefore heat dissipation of the metallic tank and its surroundings. At close range the tank can be detected even when powered down and fully concealed due to the column of warmer air above the tank and the smell of diesel(Sony VGN-FZ18L battery).

Thermal blankets slow the rate of heat emission and camouflage nets use a mix of materials with differing thermal properties to operate in the infra-red as well as the visible spectrum. Camouflage attempts to break up the distinctive appearance and silhouette of a tank(Sony Vaio VGN-FZ31B battery). Adopting a turret-down or hull-down position reduces the visible silhouette of a tank as well as providing the added protection of a position in defilade

The Russian Nakidka camouflage kit was designed to reduce the Optical, Thermal, Infrared, and Radar signatures of a tank, so that acquisition of the tank would be difficult. According to Nii Stali, the designers of Nakidka(Sony VGN-FZ145E battery), Nakidka would reduce the probabilities of detection via "visual and near-IR bands by 30%, the thermal band by 2-3 fold, radar band by 6 fold, and radar-thermal band to near-background levels. "

Armour

To effectively protect the tank and its crew, tank armour must counter a wide variety of antitank threats(Sony Vaio VGN-FZ31J battery ). Protection against kinetic energy penetrators and high explosive anti-tank (HEAT) shells fired by other tanks is of primary importance, but tank armour also aims to protect against infantry antitank missiles, ATGMs, antitank mines, bombs, direct artillery hits, and (less often) nuclear(Sony VGN-FZ140E battery), biological and chemical threats, any of which could disable or destroy a tank or its crew.

Steel armour plate was the earliest type of armour. The Germans pioneered the use of face hardened steel during World War II and the Soviets also achieved improved protection with sloped armour technology(Sony Vaio VGN-FZ21J battery). World War II developments also spelled the eventual doom of homogeneous steel armour with the development of shaped-charge warheads, exemplified by the Panzerfaust and bazooka infantry weapons which were lethally effective, despite some early success with spaced armour(Sony VGN-FZ440N battery). Magnetic mines led to the development of anti-magnetic paste and paint.

British tank researchers took the next step with the development of Chobham armour, or more generally composite armour, incorporating ceramics and plastics in a resin matrix between steel plates, which provided good protection against HEAT weapons. Squash head warheads led to anti-spall armour linings(Sony VGN-FZ11E battery), and KEPs led to the inclusion of exotic materials like a matrix of depleted uranium into a composite armour configuration.

Blazer Explosive reactive armour (ERA) blocks on an Israeli M-60

Reactive armour consists of small explosive-filled metal boxes that detonate when hit by the metallic jet projected by an exploding HEAT warhead, causing their metal plates to disrupt it(Sony VGP-BPS13B/B battery). Tandem warheads defeat reactive armour by causing the armour to detonate prematurely. Modern Reactive armour protects itself from Tandem warheads by having a thicker front metal plate to prevent the precursor charge from detonating the explosive in the reactive armour(Sony VGP-BPS13A/B battery). Reactive armours can also reduce the penetrative abilities of kinetic energy penetrators by deforming the penetrator with the metal plates on the Reactive armour, thereby reducing its effectiveness against the main armour of the tank(Sony VGP-BPS13/S battery).

Grenade launchers which can rapidly deploy a smoke screen, which are opaque to Infrared light, to hide it from the thermal viewer of another tank. The modern Shtora soft-kill countermeasure system provides additional protection by interfering with enemy targeting and fire-control systems and jamming of SACLOS guided ATGMs(Sony VGP-BPS13/B battery).

Active protection system

The latest generation of protective measures for tanks are active protection systems, particularly hard-kill countermeasures. The Soviet Drozd, the Russian Arena, the Israeli TROPHY and Iron Fist, Polish ERAWA (on PT-91), and the American Quick Kill systems show the potential to dramatically improve protection for tanks against missiles(Sony PCGA-BP2EA battery), RPGs and potentially KEP attacks, but concerns regarding a danger zone for nearby dismounted troops remain. As for 2011, only the Israeli Trophy active protection system, installed on the Merkava Mk4, has been combat-proven, as it successfully intercepted RPG rocket during operational mission on the Gaza Strip border(Sony VGP-BPS13S battery).

Mobility

Two German Army Leopard 2s demonstrate their deep-wading capabilities

The mobility of a tank is described by its battlefield or tactical mobility, its operational mobility, and its strategic mobility. Tactical mobility can be broken down firstly into agility, describing the tank's acceleration(Sony VGP-BPS13B/S battery), braking, speed and rate of turn on various terrain, and secondly obstacle clearance: the tank's ability to travel over vertical obstacles like low walls or trenches or through water. Operational mobility is a function of manoeuvre range; but also of size and weight, and the resulting limitations on options for manoeuvre(Sony VGP-BPS13A/S battery).

Strategic mobility

Strategic mobility is the ability of the tanks of an armed force to arrive in a timely, cost effective, and synchronized fashion. For good strategic mobility transportability by air is important, which means that weight and volume must be kept within the designated transport aircraft capabilities(Sony VGN-FW31J battery).

Nations often stockpile enough tanks to respond to any threat without having to make more tanks as many sophisticated designs can only be produced at a relatively low rate. The US Military for instance keeps 6000 MBTs in storage(Sony VGP-BPS21 battery).

Tactical mobility

M1 Abrams offloading from Landing Craft Air Cushioned vehicle.

Tank agility is a function of the weight of the tank due to its inertia while manoeuvring and its ground pressure, the power output of the installed power plant and the tank transmission and track design(Sony VGP-BPS21B battery). In addition, rough terrain effectively limits the tank's speed through the stress it puts on the suspension and the crew. A breakthrough in this area was achieved during World War II when improved suspension systems were developed that allowed better cross-country performance and limited firing on the move(Sony VGP-BPS21/S battery). Systems like the earlier Christie or later torsion-bar suspension developed by Ferdinand Porsche dramatically improved the tank's cross-country performance and overall mobility.

Tanks are highly mobile and able to travel over most types of terrain due to their continuous tracks and advanced suspension(Sony VGP-BPS21A/B battery). The tracks disperse the weight of the vehicle over a large area, resulting in a less ground pressure. A tank can travel at approximately 40 kilometres per hour (25 mph) across flat terrain and up to 70 kilometres per hour (43 mph) on roads, but due to the mechanical strain this places on the vehicle and the logistical strain on fuel delivery and tank maintenance(Sony VAIO PCG-5G2L battery), these must be considered "burst" speeds that invite mechanical failure of engine and transmission systems. Consequently, wheeled tank transporters and rail infrastructure is used wherever possible for long-distance tank transport. The limitations of long-range tank mobility can be viewed in sharp contrast to that of wheeled armoured fighting vehicles(Sony VAIO PCG-5G3L battery). The majority of blitzkrieg operations were conducted at the pedestrian pace of 5 kilometres per hour (3.1 mph), and that was only achieved on the roads of France.

In the absence of combat engineers, most tanks are limited to fording rivers. The typical fording depth for MBTs is approximately 1 metre (3.3 ft), being limited by the height of the engine air intake and driver's position(Sony VAIO PCG-5J1L battery). Modern tanks such as the Russian T-90 and the German Leopard I and Leopard II tanks can ford to a depth of 3–4 meters when properly prepared and equipped with a snorkel to supply air for the crew and engine. Tank crews usually have a negative reaction towards deep fording but it adds considerable scope for surprise and tactical flexibility in water crossing operations by opening new and unexpected avenues of attack(Sony VAIO PCG-5J2L battery).

Amphibious tanks are specially designed or adapted for water operations, but they are rare in modern armies, being replaced by purpose-built amphibious assault vehicles or armoured personnel carriers in amphibious assaults. Advances such as the EFA mobile bridge and MT-55 scissors bridge have also reduced the impediment to tank advance that rivers posed in World War II(Sony VAIO PCG-5K2L battery).

The M1 Abrams is powered by a 1,500 shaft horsepower (1,100 kW) Honeywell AGT 1500 gas turbine engine, giving it a governed top speed of 45 mph (72 km/h) on paved roads, and 30 mph (48 km/h) cross-country.

The tank's power plant supplies kinetic energy to move the tank, and electric power via a generator to components such as the turret rotation motors and the tank's electronic systems(Sony VAIO PCG-5L1L battery). The tank power plant has evolved from predominantly petrol and adapted large-displacement aeronautical or automotive engines during World Wars I and II, through diesel engines to advanced multi-fuel diesel engines, and powerful (per unit weight) but fuel-hungry gas turbines in the T-80 and M1 Abrams(Sony VAIO PCG-6S2L battery).

Tank power output in context:

Command, control and communications

German Army Leopard 2A6M incorporates networked battlefield technology

Commanding and coordinating tanks in the field has always been subject to particular problems, particularly in the area of communications, but in modern armies these problems have been partially alleviated by networked(Sony VAIO PCG-6S3L battery), integrated systems that enable communications and contribute to enhanced situational awareness.

Early

Armoured bulkheads, engine noise, intervening terrain, dust and smoke, and the need to operate "buttoned up" are severe detriments to communication and lead to a sense of isolation for small tank units, individual vehicles, and tank crewmen(Sony VAIO PCG-6V1L battery). Radios were not yet made portable or robust enough to be mounted in a tank, although Morse Code transmitters were installed in some Mark IVs at Cambrai as messaging vehicles, Attaching a field telephone to the rear would became a practice only during the next war(Sony VAIO PCG-6W1L battery). During World War I when these failed or were unavailable, situation reports were sent back to headquarters by some crews releasing carrier pigeons through top hatches and communications between vehicles was accomplished using hand signals, handheld semaphore flags which continued in use in the Red Army/Soviet Army through the Second and Cold wars, or by foot or horse mounted messengers(Sony VAIO PCG-7111L battery).

Modern

Merkava mk4 main battle tank is equipped with a digital C4IS battle-management system.

On the modern battlefield an intercom mounted in the crew helmet provides internal communications and a link to the radio network, and on some tanks an external intercom on the rear of the tank provides communication with co-operating infantry(Sony VAIO PCG-6W3L battery). Radio networks employ radio voice procedure to minimise confusion and "chatter".

A recent development in AFV equipment and doctrine is Network-centric warfare (US), Network Enabled Capability (UK) or Digital Army צי"ד (Israel). This consists of the increased integration of information from the fire control system(Sony VAIO PCG-7113L battery), laser rangefinder, Global Positioning System and terrain information via hardened milspec electronics and a battlefield network to display all known information on enemy targets and friendly units on a monitor in the tank. The sensor data can be sourced from nearby tanks, planes(Sony VAIO PCG-7133L battery), UAVs or (in the future) infantry. This improves the tank commander's situational awareness and ability to navigate the battlefield and select and engage targets. In addition to easing the reporting burden by automatically logging all orders and actions, orders are sent via the network with text and graphical overlays(Sony VAIO PCG-7Z1L battery).

Etymology

The word tank was first applied to the British "landships" in 1915, before they entered service, to keep their nature secret. There are at least three possible explanations of the precise origin of the term(Sony VAIO PCG-7Z2L battery):

One is it first arose in British factories making the hulls of the first battle tanks: workmen and possible spies were to be given the impression they were constructing mobile water tank for the British Army, hence keeping the production of a fighting vehicle secret(Sony VAIO PCG-8Y1L battery).

Another is the term was first used in a secret report on the new motorised weapon presented to Winston Churchill, then First Lord of the Admiralty, by British Army Lt.-Col. Ernest Swinton. From this report, three possible terms emerged: cistern, motor-war car, and tank. Apparently tank was chosen due to its linguistic simplicity(Sony VAIO PCG-8Y2L battery).

Perhaps the most compelling story comes from Churchill's authoritative biography. To disguise the device, drawings were marked "water carriers for Russia." When it was pointed out this might be shortened to "WCs for Russia," the drawings were changed to "water tanks for Russia." Eventually the weapon was just called a tank(Sony VAIO PCG-8Z2L battery).

The word "tank" was adopted in most of the languages, including Russian. Some countries, however, use different names. In Germany, tanks are usually referred to as "Panzer" (lit. "armour"), a shortened form of the full term "Panzerkampfwagen"(Sony VAIO PCG-8Z1L battery), literally "armoured fighting vehicle". In the Arab world, tanks are called Dabbāba (after a type of siege engine). In Italian, they're called "carri armati" (lit. "armed wagons"), without reference to their armour(Sony VAIO PCG-5K1L battery).