Adjustable transformer and core for tracer mechanism

Claim 1

IN A STYLUS HOLDER FOR TRACER MECHANISM A HOUSING HAVING A RADIALLY EXTENDING INTEGRAL PARTITION WALL WITH AN ELECTRICAL TRANSFORMER MOUNTED ON ONE SIDE OF SAID WALL, A TRANSFORMER CORE MOUNTED TO BE AXIALLY MOVABLE IN A CENTRAL BORE OF SAID TRANSFORMER, SAID HOUSING HAVING A COVER PLATE AT ONE END AND AN END CAP WITH A SHANK PORTION AT THE OTHER, A RADIAL FLANGE SPACED BETWEEN SAID END CAP AND PARTITION WALL FORMED INTEGRALLY WITH SAID HOUSING, A CORE OPERATOR HAVING A CONSTRICTED END EXTENDING THROUGH A BORE IN SAID PARTITION WALL AND RIGIDLY SECURED TO SAID TRANSFORMER CORE, SAID CORE OPERATOR HAVING AN ENLARGED BODY PORTION EXTENDING THROUGH AN OPENING OF SAID RADIAL FLANGE AND FORMING A SHOULDER FOR SEATING ONE END OF A COIL SPRING THE OTHER END OF WHICH ABUTS SAID PARTITION WALL TO NORMALLY BIAS SAID CORE OPERATOR AND CORE IN A DOWNWARD DIRECTION TOWARD THE END CAP, SAID RADIAL FLANGE FUNCTIONING TO RETAIN SAID CORE OPERATOR IN A CENTRAL POSITION IN SAID HOUSING, A STYLUS BAR EXTENDING THROUGH AN OPENING IN THE SHANK PORTION OF SAID END CAP HAVING A STYLUS AT ONE END AND ABUTTING SAID CORE OPERATOR AT ITS OTHER END, SAID TRANSFORMER CORE, CORE OPERATOR AND STYLUS BAR BEING MOVABLE IN AN AXIAL DIRECTION ONLY.