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    Baseball Equipment: Fields >>

    To quote the Official Rules of Major League Baseball (Rule 1.04), The field shall be a 90-foot square. The outfield shall be the area between two foul lines formed by extending two sides of the square, as in Diagram 1. Any Playing Field constructed by a professional club after June 1, 1958, shall provide a minimum distance of 325 feet from home base to the nearest fence, stand or other obstruction on the right and left field foul lines, and a minimum distance of 400 feet to the center field fence.


    Diagram 1.


    Home Plate Area

    Evolution of Home Plate

    During the early stages of baseball, home plate was circular in shape. Whatever object was available could and would be used (wood, cast iron, stone, white marble), and sometimes the object was a dish. Thus, the name plate came into use. In 1869 "home base" was transformed into a 12-inch square shape. The square was put into the ground with one point directed towards the pitcher and the opposite point directed toward the catcher. The disadvantage of the square shape was that it was difficult for both the umpires and the pitchers to pinpont the strike zone.


    Pre-1866
    Wood, cast iron or stone (white marble) Round Plate (12" diameter)

    1869-1885
    Stone or White Marble (12" square)

    1885-1899
    White Rubber
    (16" across)


    1899-Present
    White Rubber
    (17" across)

     
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