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Such a pitch presents an additional challenge to the hitter because it causes the ball to move atypically during its approach due to the altered wind-resistance and weight on one side of the ball. There is also thought that a spitball works by allowing the ball to 'slip' off of the pitcher's fingers without the usual spin that accompanies a pitcher's throwing off of the threads. In this sense, a spitball can be thought of as a fastball with knuckleball action. (See Bob Adair's analysis for example).
Alternative names for the spitball are spitter, mud ball, shine ball, supersinker, vaseline ball (because originally, Vaseline was used to give the ball a little more break), and emery ball, although technically, an emery ball is one where the ball has been abraded in much the same way that the original cut ball had been physically cut (an emery ball is also known as a scuff ball).
The invention of the spitball has been popularly credited to a number of individuals, among them Elmer Stricklett and Frank Corridon. Numerous accounts, however, refer to different players experimenting with versions of the spitball throughout the latter half of the 19th century, and it remains unlikely that any one individual "invented" the spitball.
Ed Walsh, however, is certainly responsible for popularizing it. Walsh dominated the American League from 1906–1912 primarily on the strength of his spitball, and pitchers around the league soon copied his spitball or invented their own trick pitch.
The dramatic increase in the popularity of "freak deliveries" led to a great deal of controversy throughout the 1910s regarding the abolition of the spitball and related pitches. In his autobiography, Ty Cobb wrote that such "freak pitches" "were outlawed when the owners greedily sold out to home runs."
In addition, there were serious issues with the spitball, as a variation on the standard spitball called for the pitcher to smear the entire surface of the normally white ball with a mixture of tobacco spittle and dirt or mud in order to stain it the same deep brown color as the infield, making it nearly impossible for batters to see or avoid in low-light conditions. In August 1920, Ray Chapman was famously struck in the temple and killed by a spitball thrown by pitcher Carl Mays during a poorly lit game; Chapman is the second of only two Major League Baseball players to have died as a result of an injury received in a game (the first was Mike "Doc" Powers in 1909).
The spitball was banned in two stages. In the winter of 1919–1920, managers voted to partially ban the spitball, allowing each team to designate at most two pitchers who would be permitted to legally throw spitballs. Then, following the 1920 season, the spitball was banned leaguewide, except for existing spitballers who were grandfathered in and allowed to keep throwing the pitch legally until they retired.
Seventeen existing spitballers were granted this exemption. Burleigh Grimes lasted the longest, retiring in 1934. The complete list: Doc Ayers (played through 1921); Ray Caldwell (1921); Stan Coveleski (1928); Bill Doak (1929); Phil Douglas (1922); Red Faber (1933); Dana Fillingim (1925); Ray Fisher (1920); Marv Goodwin (1925); Dutch Leonard (1925); Clarence Mitchell (1932); Jack Quinn (1933); Allen Russell (1925); Dick Rudolph (1927); Urban Shocker (1928); and Allen Sothoron (1926).
In March 1955, MLB Commissioner Ford Frick advocated for the return of the spitball, telling a sportswriter, "If I had my way, I'd legalize the old spitter. It was a great pitch and one of the easiest to throw. There was nothing dangerous about it." Despite the Commissioner's enthusiasm, the pitch remained illegal.
Although the spitball is now banned at all levels of professional and organized amateur baseball, it is still sometimes thrown in violation of the rules. (In 1942, Leo Durocher, then-manager of the Brooklyn Dodgers, fined Bobo Newsom for throwing a spitball and "lying to me about it.") Typically, a lubricant is hidden behind the pitcher's knee or under the peak of his cap. Others will place the ball in their mitt and then cough on or lick it. Another tactic pitchers use is to soak their hair in water before going out to the mound, and then rubbing their hand in their hair before a pitch. Some pitchers have even glued a piece of sandpaper to one of their fingers, and scuffed a part of the ball to achieve a similar effect to the spitball. Ted "Double Duty" Radcliffe has stated that he would hide a piece of emery board in his belt buckle so that he could roughen the ball or even cut it. During the Minnesota Twins' 1987 pennant chase, one of their starting pitchers, Joe Niekro, was suspended when he was caught on the field with a nail file in his back pocket. Niekro said in defense that he had been filing his nails, a common practice amongst knuckleball pitchers. One week later, Philadelphia Phillies pitcher Kevin Gross was caught with sandpaper in his glove and suspended.
One of the most famous spitballers was Preacher Roe, who played for the Brooklyn Dodgers in the 1950s. Roe was renowned both for his ability to control the spitball, as well as to throw it without getting caught and described his methodology in a 1955 article in Sports Illustrated, "The Outlawed Spitball Was My Money Pitch", published a year after he retired. Another famous user of the pitch was Gaylord Perry, who went so far as to title his autobiography Me and the Spitter. (For example, Gaylord would put vaseline on his zipper because umpires would never check there.) Don Drysdale and Lew Burdette also used the pitch regularly.
Legal spits 
The name dry spitter is sometimes used to describe a pitch that moves like a spitball without saliva, such as the forkball or split-finger fastball. It is sometimes used simply as slang for the knuckleball.
There is also the remote term of God-given spitter, which is when the ball is naturally dampened by moist air or light rainfall, which allows pitchers to be able to throw pitches with sharper breaks, much like a spitball.
Comparison to other sports 
Preparing a spitball is analogous to illegal ball tampering in cricket, but is not the same thing. The shining of one side of the ball, as well as the use of sweat and saliva, even when tainted with mints that a player is sucking on, is not only legal in cricket but an integral part of the game as it is used to create such phenomena as swing bowling. Illegal ball tampering in cricket includes such practices as altering of the ball's state by the use of artificial substances such as sun block, dirt or degradation by fingernails or other hard substances.
See also 
- The Neyer/James Guide to Pitchers: An Historical Compendium of Pitching, Pitchers, and Pitches. Bill James and Rob Neyer. 2004.
- Cobb, My Life in Baseball - The True Record with Al Stump (1961)
- Baseball Anecdotes. Daniel Okrent. 1989.
- "Frick Favors Return of "the Old Spitter"". Milwaukee Journal. 1955-03-08. p. 2.
- Goldstein, Richard. "Preacher Roe, Brooklyn Dodgers Star Known for His Spitball, Dies at 92", The New York Times, November 10, 2008. Accessed November 10, 2008.