Gyro platform arrangement

Claim 1

A GYRO PLATFORM FOR NAVIGATIONAL PURPOSES, SUCH AS FOR NORTH-SEEKING OR HEAD-INDICATION, COMPRISING; GIMBAL FRAMES, A PLATFORM MOUNTED IN THE SAID GIMBAL FRAMES, SAID PLATFORM HAVING A SHAFT OF ROTATION SUBSTANTIALLY PERPENDICULAR TO THE PLANE OF THE PLATFORM AND CONNECTED TO THE GIMBAL FRAMES, AT LEAST THREE MUTUALLY SIMILAR GYROS, EACH GYRO HAVING A GYRO ROTOR ROTATING ABOUT ITS SPIN AXIS AT A SPEED EQUAL TO THAT OF THE OTHER GYROS, PIVOT MOUNTINGS FOR EACH SAID GYRO ON THE PLATFORM AND POSITIONED AT EQUIANGULAR DISTANCES ABOUT SAID SHAFT OF ROTATION OF THE PLATFORM, EACH PIVOT MOUNTING COMPRISING A PIVOT AXIS BEING SUBSTANTIALLY PARALLEL TO THE PLANE OF THE PLATFORM, A CONSTANT TORQUE MEANS ON EACH GYRO FOR SEEKING TO ROTATE THE GYRO ABOUT SAID PIVOT AXIS THEREBY GENERATING A CONSTANT PRECESSIONAL FORCE ACTING ON THE PLATFORM, THEREBY CAUSING A ROTATION OF THE PLATFORM AT SUBSTANTIALLY CONSTANT SPEED ABOUT SAID SHAFT OF ROTATION, POSITION-INDICATING MEANS CONNECTED BETWEEN THE PLATFORM AND EACH GYRO FOR GENERATING SIGNALS INDICATING CHANGES FROM A PRESCRIBED POSITION OF ANGULAR EQUILIBRIUM OF THE POSITION OF EACH GYRO WITH REGARD TO THE PLATFORM.