The The Bases and Foul Lines: 1900: National League and American Association of Professional Base Ball Clubs
Baseball history diagram: Bases and Foul Lines: 1900: National League and American Association of Base Ball Clubs. Beginning in 1877, first, second and third bases became 15" x 15" and rotated one quarter-turn from their position in 1876. Home Base first takes it present day shape. Click diagram to return to previous page.