Details and Image
|Date||Scale Length||Area of Use
|Linear||Biggie Munn Grid Rule||Lufkin||USA||Wood||1957-1958||40 cm||American Football
Notes: "Clarence ""Biggie"" Munn was a legendary football coach at Michigan State University. When I was a child, my father would listen to football on the radio and chart the position of the ball on the gridiron at the end of each play; I suspect this rule was designed as an aid to this practice."