Magnetizing and demagnetizing circuit having a controlled saturable core reactor

Claim 1

A MAGNETIZING AND DEMAGNETIZING APPARATUS COMPRISING A POWER CIRCUIT OPERABLE TO MAGNETIZE AN OBJECT WHEN SAID CIRCUIT IS ENERGIZED AND TO LEAVE SAID OBJECT RESIDUALLY MAGNETIZED WHEN SAID POWER CIRCUIT IS INTERRUPTED RELATIVELY RAPIDLY AND TO DEMAGNETIZE SAID OBJECT WHEN THE CURRENT IN SAID POWER CIRCUIT IS RELATIVELY SLOWLY REDUCED TO A NEGLIGIBLE AMOUNT, FIRST SWITCH MEANS OPERABLE TO INTERRUPT SAID POWER CIRCUIT, A VARIABLE REACTANCE COIL IN SAID POWER CIRCUIT, SAID COIL HAVING A CORE WITH A CONTROL WINDING THEREABOUT, THE CURRENT ALLOWED BY SAID REACTOR TO FLOW IN SAID POWER CIRCUIT BEING DETERMINED BY THE CURRENT ALLOWED TO FLOW IN SAID CONTROL WINDING, A NORMALLY CLOSED FIRST REGULATING CIRCUIT OPERABLE TO SUPPLY A VARIABLE CURRENT TO SAID CONTROL WINDING OF A MAGNITUDE THAT PERMITS THE FLOW OF A CONTROLLED CURRENT IN SAID POWER CIRCUIT, A NORMALLY OPEN SECOND REGULATING CIRCUIT OPERABLE WHEN CLOSED TO SUPPLY CURRENT TO SAID CONTROL WINDING OF THE VALUE NECESSARY TO REDUCE TO A LOW VALUE THE CURRENT FLOWING IN SAID POWER CIRCUIT, SECOND SWITCH MEANS OPERABLE WHEN ENERGIZED TO OPEN SAID FIRST REGULATING CIRCUIT AND CLOSE SAID SECOND REGULATING CIRCUIT, AND OPERATING MEANS FOR SELECTIVELY OPENING SAID FIRST SWITCH MEANS OR ENERGIZING SAID SECOND SWITCH MEANS.