Movable core transducer

Claim 1

A POSITION-TO-VOLTAGE TRANSDUCER COMPRISING A MULTIVIBRATOR CIRCUIT, MEANS FOR SUPPLYING CURRENT TO SAID MULTIVIBRATOR CIRCUIT, SAID MEANS INCLUDING A TWO-SECTION CENTER-TAPPED PRIMARY WINDING OF A TRANSFORMER, A VOLTAGE SOURCE HAVING ONE OF ITS TERMINALS CONNECTED TO THE CENTER TAP ON SAID WINDING, THE OTHER TERMINAL OF SAID SOURCE BEING CONNECTED TO SAID MULTIVIBRATOR CIRCUIT, A PAIR OF SECONDARY WINDINGS OF SAID TRANSFORMER, SAID TRANSFORMER INCLUDING A MOVABLE CORE MEMBER FOR ADJUSTABLY COUPLING SAID PRIMARY WINDING TO SAID SECONDARY WINDINGS, AND MEANS DEVELOPING A VOLTAGE RESPRESENTATIVE OF THE NET VOLTAGE OF SAID SECONDARY WINDINGS, SAID PRIMARY WINDING BEING MOUNTED ON A COIL FORM, SAID SECONDARY WINDINGS BEING MOUNTED ON SAID COIL FORM, A MAGNETIC SHIELDING STRUCTURE PARTIALLY SURROUNDING SAID PRIMARY AND SECONDARY WINDINGS, AND SAID CORE MEMBER BEING MOVABLY MOUNTED IN SAID COIL FORM.