Self-balancing servomotor operated automatic calibrator

Claim 1

AN AUTOMATIC CALIBRATOR COMPRISING AN A.C. VOLTAGE SOURCE, A FIRST POTENTIOMETER, AND A SECOND POTENTIOMETER ALL CONNECTED IN PARALLEL WITH EACH OTHER; SAID FIRST AND SECOND POTENTIOMETERS HAVING FIRST AND SECOND SLIDER ARMS RESPECTIVELY; AN AMPLIFIER HAVING FIRST AND SECOND INPUT TERMINALS, AND FIRST, SECOND, THIRD, FOURTH, AND FIFTH OUTPUT TERMINALS; SAID FIRST INPUT TERMINAL BEING CONNECTED TO SAID FIRST SLIDER ARM, AND SAID SECOND INPUT TERMINAL BEING CONNECTED TO SAID SECOND SLIDER ARM; A FIRST TRANSISTOR HAVING FIRST EMITTER, BASE AND COLLECTOR ELECTRODES; A SECOND TRANSISTOR HAVING SECOND EMITTER, BASE AND COLLECTOR ELECTRODES; SAID FIRST OUTPUT TERMINAL OF SAID AMPLIFIER BEING CONNECTED TO THE FIRST EMITTER ELECTRODE, THE SECOND OUTPUT TERMINAL BEING CONNECTED TO SAID FIRST BASE ELECTRODE, SAID THIRD OUTPUT TERMINAL BEING CONNECTED TO SAID SECOND EMITTER ELECTRODE, AND THE FOURTH OUTPUT TERMINAL OF SAID AMPLIFIER BEING CONNECTED TO THE SECOND BASE ELECTRODE; A TRANSFORMER HAVING A CENTER TAPPED PRIMARY WINDING AND A SECONDARY WINDING; ONE END OF SAID PRIMARY WINDING BEING CONNECTED TO SAID FIRST COLLECTOR ELECTRODE, THE OTHER END OF SAID PRIMARY WINDING BEING CONNECTED TO SAID SECOND COLLECTOR ELECTRODE; A FUSE; ONE END OF SAID FUSE BEING CONNECTED TO SAID FIFTH OUTPUT TERMINAL OF SAID AMPLIFIER, THE OTHER END OF SAID FUSE BEING CONNECTED TO THE CENTER TAP ON SAID PRIMARY WINDING OF THE TRANSFORMER; A SERVOMETER HAVING FIRST AND SECOND WINDINGS; SAID FIRST WINDING BEING CONNECTED IN PARALLEL WITH SAID SECONDARY WINDING, SAID SECOND WINDING BEING CONNECTED DIRECTLY ACROSS SAID A.C. VOLTAGE SOURCE; A SHAFT MEANS DRIVEN BY SAID SERVOMOTOR; A DIGITAL READOUT METER; SAID SHAFT MEANS DRIVING BOTH THE FIRST SLIDER ARM OF SAID FIRST POTENTIOMETER AND SAID DIGITAL READOUT METER; SAID DIGITAL READOUT METER INDICATING THE POSITION OF SAID FIRST SLIDER ARM ALONG SAID FIRST POTENTIOMETER FROM ZERO TO ONE HUNDRED PERCENT; AND A D.C. SOURCE OF VOLTAGE CONNECTED TO SAID AMPLIFIER FOR SUPPLYING POWER THERETO.