Contents

12 May 1972
Vol 176, Issue 4035

About The Cover

First sheet of patent for the Sperry basic gyrocompass patent (1911). Key: 2, gyro wheel case; 10, cardan ring; 17, phantom; 18, suspension or torsion wire; 19, gimbal ring; 21, horizontal pivots; 27, compass card; 28 and 29, gears driven by servomotor (not shown); 31, trolley; 32, contacts; 49, bail; 49b, yeielding connection. From Elmer Sperry: Inventor and Engineer, reviewed on page 668.