While reading Rule 5.05, I came across the following in (a)(5):
A fair ball passes over a fence or into the stands at a distance from home base of 250 feet or more. Such hit entitles the batter to a home run when he shall have touched all bases legally. A fair fly ball that passes out of the playing field at a point less than 250 feet from home base shall entitle the batter to advance to second base only;
I am unable to picture a stadium having a wall in fair territory less than 250 feet away from home. In fact, a mandate from Rule 2.01 says:
The distance from home base to the nearest fence, stand or other obstruction on fair territory shall be 250 feet or more.
What is the historical significance, if any, of having "less than 250 feet" in rule 5.05(a)(5) if ballparks cannot have walls less than 250 feet away from home plate (per rule 2.01)?