Operational range of bellows

Claim 1

A GYROSCOPIC INSTRUMENT COMPRISING A HOUSING, AN ENCLOSED GIMBAL, SUPPORT MEANS MOUNTING SAID GIMBAL WITHIN SAID HOUSING FOR ARCUATE MOVEMENT ABOUT A LONGITUDINAL AXIS, A DAMPING LIQUID FILLING SAID HOUSING, THE VOLUME AND VISCOSITY OF SAID DAMPING LIQUID VARYING WITH AMBIENT TEMPERATURE, A RESILIENT BELLOWS ASSEMBLY MOUNTED WITHIN SAID HOUSING, A SHEAR PLATE ASSEMBLY MOUNTED WITHIN SAID HOUSING AND HAVING A PAIR OF RELATIVELY MOVABLE SHEAR PLATE ELEMENTS, ONE OF SAID ELEMENTS BEING SUPPORTED ON SAID GIMBAL AND THE OTHER OF SAID ELEMENTS BEING SUPPORTED BY SAID BELLOWS ASSEMBLY IN SPACED RELATION TO THE FIRST MENTIONED SHEAR PLATE ELEMENT SO AS TO DEFINE THEREBETWEEN A SHEAR SPACE, SAID DAMPING LIQUID BEING APPLIED IN SAID SHEAR SPACE IN COOPERATIVE RELATION BETWEEN SAID SHEAR PLATE ELEMENTS TO DAMPEN ARCUATE MOVEMENT OF SAID GIMBAL ABOUT SAID LONGITUDINAL AXIS, SAID BELLOWS ASSEMBLY INCLUDING A PLURALITY OF BELLOWS OF DIFFERENT SIZE, EACH HAVING A RESILIENT BIASING MEANS THEREIN FOR CONTINUOUSLY URGING SAID BELLOWS TOWARD AN EXPANDED CONDITION TO ADJUSTABLY POSITION THE OTHER SHEAR PLATE ELEMENT RELATIVE TO THE ONE SHEAR PLATE ELEMENT TO VARY THE SHEAR SPACE AND THEREBY THE DAMPING LIQUID APPLIED BETWEEN SAID SHEAR PLATE ELEMENTS UPON A CHANGE IN THE AMBIENT TEMPERATURE SO AS TO MAINTAIN THE DAMPING COEFFICIENT OF SAID DAMPING LIQUID APPLIED BETWEEN SAID SHEAR PLATE ELEMENTS SUBSTANTIALLY CONSTANT OVER A WIDE TEMPERATURE RANGE.