Harmonic and phase shift suppressor means

Claim 1

IN A VOLTAGE CONTROL SYSTEM COMPRISING A WHEATSTONE TYPE BRIDGE CIRCUIT CONTAINING TWO SETS OF OPPOSED BRIDGE IMPEDANCES AND TWO SETS OF OPPOSED CORNERS, MEANS FOR IMPRESSING A VOLTAGE ACROSS ONE SET OF CORNERS, AND MEANS FOR VARYING THE MAGNITUDE OF AT LEAST ONE SET OF SAID BRIDGE IMPEDANCES FOR PRODUCING A VARIABLE VOLTAGE ACROSS THE OTHER SET OF CORNERS, SAID MEANS BEING RESPONSIVE TO A SELECTED ELECTRICAL CONDITION IN THE SYSTEM WHICH VARIES FROM A NORMAL VALUE TO VALUES ABOVE AND BELOW NORMAL; THE IMPROVEMENT WHICH COMPRISES OTHER IMPEDANCE VARYING MEANS ASSOCIATED WITH TWO ADJACENT ONES OF SAID BRIDGE IMPEDANCES THAT ARE CONNECTED IN SERIES WITH EACH OTHER BETWEEN THE SAID OTHER SET OF SAID BRIDGE CORNERS, CIRCUIT MEANS FOR DERIVING A SIGNAL RESPONSIVE TO THE VARIATIONS IN SAID ELECTRICAL CONDITION, AND MEANS RESPONSIBLE TO SAID SIGNAL AND CONNECTED TO SAID OTHER, IMPEDANCE VARYING MEANS FOR VARYING THE MAGNITUDE OF SAID TWO ADJACENT BRIDGE IMPEDANCES RESPONSIVE TO SAID SELECTED ELECTRICAL CONDITION SO THAT THE MAGNITUDE OF THE SAID TWO ADJACENT BRIDGE IMPEDANCES IS SUBSTANTIALLY AT A MINIMUM WHEN SAID ELECTRICAL CONDITION IS AT ITS NORMAL VALUE.