Improvements in or relating to apparatus for indicating or recording the velocity ofa rotary body or a part driven thereby

摘要

591,650. Electric speedometers. HABERSHON & SONS, Ltd., J. J., and GROVER, J. J. May 15, 1945, No. 12237. [Class 40 (i)] Apparatus for measuring the velocity of a rotary body comprises an alternating current generator 3 having a permanent magnet rotor adapted to be driven from the rotary body, the current generated controlling a moving- coil recording or indicating instrument or both, through a thermo-couple 10 in proximity to a heating coil 5 both operating in vacuo.