Battery discharge indicator

Claim 1

AN ELECTRICAL SYSTEM COMPRISING, A SOURCE OF DIRECT CURRENT, FIRST AND SECOND CONDUCTORS CONNECED WITH OPPOSITE SIDES OF SAID SOURCE OF DIRECT CURRENT, A BATTERY CONNECED ACROSS SAID SOURCE OF DIRECT CURRENT, AN ELECTRICAL LOAD CONNECTED ACROSS SAID FIRST AND SECOND CONDUCTORS, A SEMICONDUCTOR HAVING FIRST, SECOND AND THIRD TERMINALS, THE CONDUCTION OF SAID SEMICONDUCTOR BETWEEN ITS FIRST AND THIRD TERMINALS BEING CONTROLLED BY THE RELATIVE POTENTIAL OF FIRST AND SECOND TERMINALS, AN ELECTRICALLY ENERGIZABLE INDICATING DEVICE RESPONSIVE TO AN ELECTRICAL POTENTIAL, MEANS CONNECTING SAID INDICATING DEVICE AND THE FIRST AND THIRD TERMINALS OF SAID SEMICONDUCTOR IN SERIES ACROSS SAID FIRST AND SECOND CONDUTORS, MEANS CONNECTING SAID FIRST AND SECOND TERMINALS OF SAID SEMICONDUCTOR ACROSS SAID FIRST AND SECOND CONDUCTORS, THE POTENTIAL OF SAID FIRST AND SECOND CONDUCTORS BEING OF SUCH A POLARITY AS TO BIAS SAID SEMICONDUCTOR TO A CONDUCTIVE STATE TO THEREBY COMPLETE A CIRCUIT FOR SAID ELECTRICALLY ENERGIZABLE INDICATING DEVICE, A MAGNETIC AMPLIFIER INCLUDING A REACTOR WINDING, SAID FIRST CONDUCTOR BEING MAGNETICALLY COUPLED WITH SAID REACTOR WINDING, A SOURCE OF ALTERNATING CURRENT, A DIODE, A CONTROL CIRCUIT HAVING DIRECT CURRENT OUTPUT TERMINALS INCLUDING SAID DIODE AND SAID REACTOR WINDING CONNECTED ACROSS SAID SOURCE OF ALTERNATING CURRENT, SAID REACTOR WINDING HAVING A LOWER IMPEDANCE WHEN SAID BATTERY IS BEING CHARGED THROUGH SAID FIRST CONDUCTOR BY SAID DIRECT CURRENT SOURCE THAN WHEN SAID BATTERY IS DISCHARGING THROUGH SAID FIRST CONDUCTOR AND THROUGH SAID ELECTRICAL LOAD, SAID CONTROL CIRCUIT DEVELOPING A CONTROL VOLTAGE AT THE DIRECT CURRENT OUTPUT TERMINALS OF SAID CONTROL CIRCUIT, SAID CONTROL VOLTAGE VARYING IN MAGNITUDE IN ACCORDANCE WITH THE IMPEDANCE OF SAID REACTOR WINDING, AND MEANS CONNECTING SAID DIRECT CURRENT, OUTPUT TERMINALS OF SAID CONTROL CIRCUIT RESPECTIVELY WITH SAID SECOND TERMINAL OF SAID SEMICONDUCTOR AND SAID SECOND CONDUCTOR, SAID CONTROL VOLTAGE HAVING A MAGNITUDE SUFFICIENT TO BIAS SAID SEMICONDUCTOR TO A NONCONDUCTIVE CONDITION TO DEENERGIZE SAID ELECTRICALLY ENERGIZABLE INDICATING DEVICE WHEN SAID BATTERY IS BEING CHARGED, THE MAGNITUDE OF SAID CONTROL VOLTAGE BEING INSUFFICIENT TO BIAS SAID SEMICONDUCTOR TO A NONCONDUCTIVE CONDITION WHEN SAID BATTERY IS DISCHARGING.