Transformer telephone influence tractor core shunt

Claim 1

The combination with a transformer of the type having an enclosed core and an electrical coil assembly mounted on each of the legs of the core, said core being formed from a flat continuous strip of magnetic material which is spirally wound into a plurality of concentratic superposed turns, said strips being cut to form a plurality of strips having a length equal to slightly less than one complete turn in said core to form a series of staggered gaps between the ends of the strips at one end of said core with a corresponding high flux density area, the improvement comprising a shunt packet mounted in abutting relation to each side of said core in a position to bridge the high flux density area at said one end of the core, each shunt packet including one or more steel laminations, said laminations having a thickness corresponding to the difference in the cross sectional area of the core and the cross sectional area of the core through the air gaps at said one end of the core.