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Claim 1

IN A DEVICE OF THE CHARACTER DESCRIBED INCLUDING A PLURALITY OF LAYERS CONTINUOUSLY ROLLED INTO A COMPACT UNIT SAID DEVICE COMPRISING A PAIR OF CONDUCTING LAYERS INSULATED FROM EACH OTHER BY A SHEET OF INSULATION, ONE OF SAID CONDUCTION LAYERS HAVING AN EDGE EXTENDING LATERALLY BEYOND THE EDGE OF THE INSULATION AND THE EDGE OF THE OTHER LAYER ON ONE SIDE ONLY, SAID EXTENDING EDGE PORTION OF SAID LAYER BEING GROUNDED THROUGHOUT THE LENGTH OF SAID EDGE PORTION, THE OPPOSITE EDGE OF SAID GROUNDED LAYER LYING WITHIN THE EDGE OF THE INSULATION, THE UNGROUNDED LAYER BEING CONNECTED IN A THROUGH CIRCUIT BY LEADS CONNECTED THERETO AT SPACED POINTS, THE UNGROUNDED CONDUCTING LAYER FORMING AN INDUCTANCE IN THE THROUGH CIRCUIT IN WHICH IT IS CONNECTED AND A DISTRIBUTED CAPACITANCE WITH SAID GROUNDED LAYER, SAID SPACED CONNECTIONS BEING SHIELDED FROM EACH OTHER, AND AN UNGROUNDED LAYER OF MAGNETIC MATERIAL IN END TO END SPACED RELATION WITH SAID GROUNDED LAYER BEYOND THE END OF SAID GROUNDED LAYER AND INSULATED FROM SAID UNGROUNDED LAYER TO INCREASE SAID INDUCTANCE WITHOUT CAPACITANCE COUPLING TO GROUND, SAID LAYER OF MAGNETIC MATERIAL FORMING A CONVOLUTION OF SAID ROLLED MASS.