Method of making a magnetic core

Claim 1

THE METHOD OF MAKING A MAGNETIC CORE FOR USE IN A PREFORMED COIL COMPRISING THE STEPS OF, WINDING A PLURALITY OF TURNS OF ORIENTED MAGNETIC STRIP TO FORM A CLOSED LOOP, CUTTING THE CORE ALONG A LINE SUBSTANTIALLY AT RIGHT ANGLES TO THE TURNS TO PROVIDE INDEPENDENT LAMINATIONS DISPLACING THE CUT IN EACH TURN WITH RESPECT TO THE CUT IN EACH ADJACENT TURN, SO ARRANGING THE INDIVIDUAL TURNS WITH THE CUT ENDS OF EACH TURN OPPOSITE EACH OTHER AND WITH THE CUT IN EACH TURN OVERLAPPING THE CUT IN EACH ADJACENT TURN THAT THE CUTS PROVIDE A STEPPED JOINT IN THE CORE, DISPLACING THE CUTS IN THE OUTER TURNS RELATIVE TO THE CUTS IN THE INNER TURNS, SO SHAPING THE CORE TO A DESIRED SHAPE HAVING A YOKE AND LEGS THAT THE DISPLACED CUTS IN THE OUTER TURNS AND THE CUTS IN THE INNER TURNS ARE DIVIDED WITH THE JOINTS OF THE INNER TURNS ON THE YOKE AND WITH THE JOINTS OF THE OUTER TURNS ON THE INNER LEG OF SAID CORE WHEN THE CORES IS ASSEMBLED IN THE WINDOW OF A COIL, WITH MOST OF SAID JOINTS BEING IN SAID YOKE, AND ANNEALING THE SHAPED CORE TO RELIEVE STRESSES.