Biased synchro control all attitude pitch indicator

Claim 1

A CORRECTION CIRCUIT FOR GENERATING A SINUSOIDAL CORRECTION VOLTAGE IN A SERVO SYSTEM HAVING A FIRST AND SECOND ELECTRICALLY CONNECTED STATOR WINDING OF A FIRST AND SECOND RESPECTIVE SERVO DEVICE; SAID CORRECTION CIRCUIT INCLUDING A RESISTOR CONNECTED IN THE CIRCUIT FORMING SAID ELECTRICAL CONNECTION BETWEEN SAID FIRST AND SECOND STATOR WINDINGS; EACH OF SAID FIRST AND SECOND SERVO DEVICES HAVING RESPECTIVE ROTOR WINDINGS; A VOLTAGE CONTROLLED BY THE VOLTAGE DROP ACROSS SAID RESISTOR BEING OPERATIVELY CONNECTED IN SERIES WITH ONE OF SAID ROTOR WINDINGS BY CIRCUIT CONNECTING MEANS; SAID CIRCUIT CONNECTING MEANS INCLUDING AMPLIFIER MEANS FOR CONTROLLING THE MAGNITUDE OF THE CORRECTING VOLTAGE; SAID AMPLIFIER MEANS INCLUDING AN AUXILIARY SERVO MEANS HAVING A ROTOR AND A FIRST AND SECOND STATOR WINDING; SAID RESISTOR BEING CONNECTED IN SERIES WITH SAID FIRST AND SECOND STATOR WINDINGS; THE ROTOR WINDING OF SAID AUXILIARY SERVO MEANS BEING CON-