| 摘要 |
A device for laying out the base lines and the locations of the bases and pitcher's mound of a baseball diamond. A flat five-sided plate overlies home plate and has a pair of rails which extend below the first plate and abut against the edges of the home plate on the base lines to the first and third bases. A pair of reels of non-elastic cord are mounted on the flat plate and the cords from these reels drawn along the right and left rails, respectively. The cords have marks to indicate where their ends are a distance of 90 feet from the point of the home plate. A second mark on each cord indicates a distance of 180 feet from the point of the home plate. A third reel is also provided and the cord from this reel extends along the bisector of the angle between the first two cords. A third rail is provided on the flat plate to indicate when the third cord is being drawn along the proper line. This cord has a mark indicating the distance from the home plate to second base and from hole plate to the pitcher's mound.
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