I was reading the “Hey Bill” Q&A section of Bill James’ site, and this question was posed:
Hey Bill, I thought it was interesting in 1939 the National Professional Indoor Baseball League was launched with Tris Speaker and franchises managed by guys like Bill Wambsganss, Moose McCormick, and Harry Davis. It went one and done though, disbanded after that season. Do you know how the actual play was set up?
Answered: 1/21/2015
Don’t know that I’ve ever heard of it.•
Indoor baseball, while clearly nowhere near as popular as its outdoor counterpart, was a dogged part of the American sporting scene from the 1890s till the late ’30s. Before the game essentially became softball, it was played on a pro level during the winter months at armories in front of crowds of up to 1,500 fans. Decidedly different than the summer game were the rules (e.g., 35-foot basepaths) and equipment (ball was larger and softer). The most famous iteration of the game was the short-lived 1939 National Professional Indoor Baseball League, which was presided over by the former MLB great Tris Speaker. Below are several pieces from the Brooklyn Daily Eagle about various versions of the game.
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From May 5, 1912:
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From November 20, 1939: