Radiation gauge system with controls

Claim 1

MEASUREMENT APPARATUS COMPRISING, A RADIATION DETECTOR PRODUCING A DIRECT CURRENT OUTPUT SIGNAL VARYING IN ACCORDANCE WITH VARIATIONS IN INCIDENT RADIATION; AN OSCILLATOR ADAPTED TO PROVIDE AN OUTPUT SIGNAL AT A FREQUENCY WHICH IS SUBSTANTIALLY 80 CYCLES PER SECOND; A SERVO MECHANICAL MOTOR HAVING SIGNAL WINDINGS, LINE WINDINGS, AND AN OUTPUT SHAFT, THE ROTARY POSITION OF SAID OUTPUT SHAFT BEING RESPONSIVE TO DIFFERENCES IN MAGNITUDE AND PHASE BETWEEN SIGNALS APPLIED TO SAID LINE WINDINGS AND SAID SIGNAL WINDINGS; A VIBRATING CAPACITOR DRIVEN BY SAID OSCILLATOR OUTPUT SIGNAL; MEANS FOR APPLYING A PORTION OF SAID RADIATION DETECTOR OUTPUT SIGNAL TO SAID VIBRATING CAPACITOR, THEREBY MODULATING SAID PORTION OF SAID OUTPUT SIGNAL AT SUBSTANTIALLY 80 CYCLES PER SECOND;