Patent ID: 7887443

Claim:
An apparatus for measuring a circular line representing a pitcher's circle around a pitcher's plate for softball, said apparatus comprising: a) a frame member, b) a centering axis member, c) a flexible measuring line having a fixed, predetermined length, and d) a guide rod, said frame member having a dimension approximating a standard dimension of said pitcher's plate, said frame member being adapted to be fit over and engage said pitcher's plate in a fixed relationship, said frame member forming downwardly depending flange edges adapted to engage outer side edges of said pitcher's plate, said centering axis member being disposed in a center of said frame member, said measuring line being connected to said centering axis member, said guide rod being connected to a distal end of said measuring line such that said guide rod represents a radius distance point of said pitcher's circle from said pitcher's plate, said guide rod being adapted to be moved in an arc defined by said radial distance about said centering axis member in a horizontal plane about said pitcher's plate over an area representing said pitcher's circle.