Precision transducer

Claim 1

PRECISION ELECTRICAL POSITION MEASURING TRANSFORMER APPARATUS COMPRISING (A) TWO RELATIVELY MOVABLE RIGID POSITION MEASURING TRANSFORMER MEMBERS EACH HAVING (B) A BASE OF METAL HAVING, (C) A FILM-LIKE LAYER OF BONDING AND INSULATING MATERIAL ADHESIVELY AFFIXED TO ONE SURFACE THEREOF, (D) SAID LAYER OF BONDING AND INSULATING MATERIAL HAVING A THICKNESS OF THE ORDER OF .001 TO .010 INCH, (E) AN ELECTRICAL WINDING OF A PLURALITY OF METALLIC CONDUCTORS DISPOSED SIDE-BY-SIDE, EXTENDING TRANSVERSELY OF THE DIRECTION OF RELATIVE MOTION OF SAID MEMBERS AND CONNECTED IN SERIES FOR OPPOSITE DIRECTIONS OF CURRENT FLOW IN ADJACENT CONDUCTORS, AND HAVING (F) A THICKNESS OF THE ORDER OF .0005 TO .005 INCH, AND (G) ADHESIVELY AFFIXED TO THE SURFACE OF SAID BONDING AND INSULATING LAYER OF EACH OF SAID METAL BASES, (H) SAID THIN BONDING AND INSULATING LAYER ON EACH OF SAID METAL BASES BEING ADAPTED TO MAINTAIN THE SAID WINDING CONDUCTORS AND THE SAID METAL BASE IN ELECTRICALLY INSULATED RELATION AS A UNIT, (I) SAID WINDINGS BEING INDUCTIVELY COUPLED AND HAVING AN INDUCTIVE COUPLING CHARACTERISTIC OF SUBSTANTIALLY SINUSOIDAL FORM, (J) SAID ELECTRICAL WINDINGS BEING SECURED TO THEIR RESPECTIVE METAL BASES IN CLOSE AND INTIMATE RELATION THEREWITH, THEREBY MINIMIZING INTERFERENCE WITH THE FORM OF COUPLING WAVE BETWEEN SAID WINDINGS, (K) THE ADHESIVE CHARACTERISTICS AND THE THINNESS OF THE FILM-LIKE BONDING AND INSULATING LAYER AND THE METAL AND THINNES OF THE CONDUCTOR WINDINGS ALL BEING SUCH THAT THE POSITION OF THE CONDUCTOR WINDINGS CHANGES IN ACCORDANCE WITH THE CHANGES IN THE SURFACE LENGTH OF THE METAL BASE PRODUCED BY VARITIONS IN AMBIENT TEMPERATURE, (L) SAID METAL BASES OF SAID RELATIVELY MOVABLE MEMBERS HAVING SUBSTANTIALLY IDENTICAL COEFFICIENTS OF EXPANSION.