On December 26, 1906 — In an effort to prevent hitters from rubbing out chalk lines, National League umpire Hank O’Day suggests white rubber strips be used to mark out the batter’s box. The former right-handed hurler and future Hall of Famer will interrupt his 30-year umpiring career to manage the Reds in 1912 and the Cubs in 1914, becoming the only person ever to play, manage, and umpire for a full season in the major leagues.

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