Instrument for measuring torsional creep and recovery

Claim 1

AN APPARATUS FOR IMPRESSING SHEAR LOADING ON A MATERIAL SPECIMEN WITH A MINIMUM OF RESIDUAL TORQUE COMPRISING A FIRST HOUSING, SAID FIRST HOUSING INCLUDING A CONTAINER FOR CONTAINING A FLUID, A SECOND HOUSING OPPOSITELY SECURED TO SAID FIRST HOUSING, AN ADJUSTABLE MEMBER DISPOSED IN SAID SECOND HOUSING AND CENTRALLY LOCATED THEREIN, MEANS FOR MOVING SAID ADJUSTABLE MEMBER TOWARD AND AWAY FROM SAID FIRST HOUSING, A FLOAT IMMERSED IN THE FLUID SUPPLY BETWEEN SAID ADJUSTABLE MEMBER AND SAID CONTAINER FOR CARRYING THE MATERIAL SPECIMEN WHEREBY A CONSTANT SPECIMEN HEIGHT MAY BE MAINTAINED BY MOVING SAID ADJUSTABLE MEMBER WHILE IN CONTACT WITH THE MATERIAL SPECIMEN, A COUPLING ROD SECURED TO SAID FLOAT, A DISC, SAID DISC BEING SECURED TO THE OPPOSITE END OF SAID COUPLING ROD AND SUSPENDED THEREBY, MEANS FOR ALTERNATELY PRODUCING EDDY CURRENTS AND A MAGNETIC FIELD IN SAID DISC THEREBY IMPARTING A ROTATIONAL FORCE THERETO, AND MEANS FOR PROJECTING THE ANGLE OF ROTATION OF SAID FLOAT RELATIVE TO SAID ADJUSTABLE MEMBER WHEN THE MATERIAL SPECIMEN IS IN CONTACT WITH SAID FLOAT AND SAID ADJUSTABLE MEMBER AND SAID FLOAT IS AT AN EQUILIBRIUM LEVEL IN SAID FLUID.