Seismic amplifier interference eliminator

Claim 1

IN A SEISMIC AMPLIFIER SYSTEM, INCLUDING A GEOPHONE ELECTRICALLY CONNECTED TO AN AMPLIFIER THROUGH TWO ELECTRICAL CONDUCTORS, THE IMPROVEMENT WHICH COMPRISES MEANS FOR EQUALIZING, WITH RESPECT TO A FIXED GROUND POTENTIAL, THE MAGNITUDE OF INTERFERING VOLTAGES GENERATED IN EACH OF SAID CONDUCTORS, LEAVING BETWEEN THE TWO CONDUCTORS A RESULTANT VOLTAGE DUE TO PHASE DIFFERENCES BETWEEN THE MAGNITUDE EQUALIZED VOLTAGES, MEANS FOR DEVELOPING FROM SAID RESULTANT VOLTAGE, IN CONJUNCTION WITH SAID MAGNITUDE EQUALIZING MEANS, A FIRST VOLTAGE 90* OUT OF PHASE WITH SAID RESULTANT VOLTAGE, FIXED PHASE SHIFTING MEANS FOR SHIFTING THE PHASE OF SAID FIRST VOLTAGE BY 90*, TO THEREBY PROVIDE A SECOND VOLTAGE 180* OUT OF PHASE WITH SAID RESULTANT VOLTAGE MEANS FOR ADJUSTING THE MAGNITUDE OF SAID SECOND VOLTAGE TO MAKE IT EQUAL TO THE MAGNITUDE OF SAID RESULTANT VOLTAGE AND MEANS FOR INJECTING SAID ADJUSTED SECOND VOLTAGE IN SAID AMPLIFIER WHEREBY TO CANCEL SAID RESULTANT VOLTAGE.