Photocell actuated current control circuit

Claim 1

THE COMBINATION WITH A LOAD CIRCUIT; MEANS FOR SUPPLYING POWER TO THE LOAD CIRCUIT; AN INTERRUPTER CIRCUIT ADAPTED TO INTERRUPT THE POWER AT A PREDETERMINED LINE CURRENT VALUE, SAID INTERRUPTER CIRCUIT INCLUDING A DIRECT VOLTAGE SOURCE; A CONTROL RELAY COIL; A SUBSTANTIALLY LOW IMPEDANCE COIL DISPOSED TO PRODUCE A MAGNETIC FIELD PROPORTIONAL TO SAID LINE CURRENT VALUE; A NORMALLY OPEN MAGNETIC FIELD OPERATED SWITCH DISPOSED TO BE CLOSED BY THE FIELD PRODUCED BY SAID LOW IMPEDANCE COIL AT SAID PREDETERMINED LINE CURRENT VALUE; A CAPACITOR CONNECTED TO BE CHARGED BY THE DIRECT VOLTAGE SOURCE WHEN SAID SWITCH IS OPEN; A PHOTOCELL TUBE CONNECTED IN SERIES WITH SAID RELAY COIL AND THE SERIES COMBINATION THEREOF BEING CONNECTED IN PARALLEL WITH SAID CAPACITOR AND FURNISHING A DISCHARGE PATH THEREFOR WHEN SAID PHOTOCELL TUBE IS CONDUCTIVE; AN ELECTRIC LIGHT SOURCE CONNECTED IN SERIES WITH SAID SWITCH AND ARRANGED TO BE ENERGIZED WHEN SAID SWITCH IS CLOSED UPON THE OBTAINING OF SAID VALUE WHEREBY TO ACTUATE SAID PHOTOCELL TUBE, DISCHARGE SAID CAPACITOR THROUGH SAID RELAY COIL AND THEREBY ACTUATE SAID INTERRUPTER.