Method of making magnetic cores

Claim 1

A METHOD OF MAKING A MAGNETIC CORE WHICH HAS A WINDOW OPENING AND LINKING THE SAME WITH A PREFORMED ELECTRICAL COIL WHICH HAS A WINDOW OPENING, SAID METHOD COMPRISING PROVIDING A SPIRALLY WOUND CORE OF FLAT STRIP MAGNETIC MATERIAL HAVING A PLURALITY OF RADIALLY SUPERPOSED TURNS, HEAT TREATING THE WOUND CORE, CUTTING THE STRIP OF MAGNETIC MATERIAL INTO SUCCESSIVE SEGMENTS BY STARTING AT ITS INNER END AND PROGRESSIVELY CUTTING IT TOWARD ITS OUTER END, THE SUCCESSIVE SEGMENTS BEING CUT ONE AT A TIME AND WITHOUT UNWINDING OF THE STRIP BY CUTTING THE STRIP WHILE THE SUCCESSIVE SEGMENTS ARE NESTED SUBSTANTIALLY IN THE SAME POSITION AS THEY HAD IN THE WOUND CORE WHILE BEING HEAT TREATED AND WHILE ITS INNER END IS STILL LOCATED INSIDE THE WOUND CORE, AND LIFTING EACH SEGMENT FROM INSIDE THE WOUND CORE AFTER IT IS CUT AND LACING IT WITH THE PREFORMED ELECTRICAL COIL WHILE ITS IMMEDIATELY SUCCESSIVE SEGMENT IS BEING CUT.