On ,December 10 1919
The National League, spearheaded by the leadership of Pirates owner Barney Dreyfuss, approves the banning of the spitball, allowing just the current spitballers presently throwing the pitch to use it under a “grandfather” clause. The ban will  be formally worked out by the rules committee in February.

A year later the American League will adopt the same rule.

 


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Sources:

Baseball Reference December 10

SABR Games Project

National Pastime December 10

Hall of Fame

Replay The Game

Ret