Copyright date 1955, Patent number 2528518, 2767919, 2775404
1/8 x 4 1/4 x 4 1/4 in.
Jeppensen slide flight computer consists of four plastic wheels and ruler. Printed text on middle of front wheel includes "Jeppesen model CR-2 computer". Front of computer indicates text for calculating air speed, temperature, and altitude. The back indicates text for calculating crosswinds. Smudge on ruler left of center hole.