Angular position indicators

Claim 1

APPARATUS FOR INDICATING THE ANGULAR POSITION OF A SYNCHRO-RESOLVER COMPRISING, IN COMBINATION: A SOURCE OF SINUSOIDAL VOLTAGE OF THE FORM K1 SIN WT ENERGIZING SAID RESOLVER, SAID RESOLVER HAVING AN OUTPUT VOLTAGE OF THE FORM K2 SIN (WT) SIN 0, 0 REPRESENTING THE ANGULAR POSITION OF SAID RESOLVER, K1 AND K2 REPRESENTING CONSTANTS; A FIRST TRANSFORMER WITH FIRST AND SECOND PRIMARY WINDINGS AND A SECONDARY WINDING, THE FIRST AND SECOND PRIMARY WINDINGS BEING ENERGIZED WITH THE VOLTAGES K2 SIN (WT) SIN 0 AND K1 SIN WT RESPECTIVELY, THE WINDINGS TURNS RATIO SELECTED SUCH THAT THE VOLTAGE ACROSS THE OUTPUT WINDING HAS THE FORM K1 SIN WT (SIN0+1); A SECOND TRANSFORMER HAVING A PRIMARY WINDIND AND A SECONDARY WINDING, THE PRIMARY WINDING BEING ENERGIZED BY THE VOLTAGE K1 SIN WT, THE VOLTAGE PRODUCED ACROSS THE SECONDARY WINDING BEING OF THE FORM -K1 SIN WT; A REBALANCEABLE POTENTIOMETER, HAVEING A WIPER, CONNECTED IN SERIES WITH THE SECONDARY WINDINGS OF SAID FIRST AND SECOND TRANSFORMERS, THE SECONDARY WINDINGS BEING CONNECTED IN SERIES AND GROUNDED AT A COMMON JUNCTION; MEANS FOR AMPLIFYING AN ERROR SIGNAL APPEARING AT THE POTENRIOMETER WIPER; INDICATOR MEANS; AND PHASE SENSITIVE MOTOR MEANS DRIVEN BY SAID AMPLIFYING MEANS CONNECTED TO DRIVE INDICATOR AND THE WIPER ON SAID REBALANCEABLE POTENIOMETER.