Electrical apparatus and method of making same

Claim 1

A TRANSFORMER COMPRISING CORE ELEMENTS JOINED BY YOKE ELEMENTS EXTENDING THEREBETWEEN, A WINDING SURROUNDING ONE OF SAID CORE ELEMENTS BETWEEN SAID YOKE ELEMENTS, FIRST CLAMPING MEANS ENGAGING A YOKE ELEMENT AND SAID CORE ELEMENTS IN A FIRST PLANE ADJACENT ONE END OF SAID WINDING, SECOND CLAMPING MEANS ENGAGING ANOTHER YOKE ELEMENT AND SAID CORE ELEMENTS IN A SECOND PLANE PARALLEL TO SAID FIRST PLANE AND ADJACENT THE OTHER END OF SAID WINDING, AN INSULATING PLATE AT EACH END OF SAID WINDING SURROUNDING SAID ONE CORE ELEMENT AND INSULATING SAID WINDING FROM SAID CLAMPING MEANS, THE INSULATING PLATE ADJACENT SAID FIRST CLAMPING MEANS BEING FIXED AND THE INSULATING PLATE ADJACENT SAID SECOND CLAMPING MEANS BEING MOVABLE ALONG SAID ONE CORE ELEMENT AWAY FROM SAID SECOND CLAMPING MEANS, AND A PLURALITY OF EXPANDABLE SPACERS FORMED OF ELECTRICAL INSULATING MATERIAL INTERPOSED BETWEEN SAID SECOND CLAMPING MEANS AND THE ADJACENT INSULATING PLATE FOR MOVING SAID INSULATING PLATE AWAY FROM SAID SECOND CLAMPING MEANS AND THUS EXERTING CLAMPING PRESSURE ON SAID WINDING, SAID SPACERS EACH COMPRISING A PAIR OF COOPERATING WEDGES HAVING SLANTING FACES, SAID PAIRS OF WEDGES BEING ADJUSTABLY CONNECTED TOGETHER AND OPPOSITELY DISPOSED IN FACE-TO-FACE RELATION WITH THEIR SLANTING FACES IN SLIDING ENGAGEMENT AND THEIR TOP AND BOTTOM SURFACES PARALLEL.