Precision angle encoder transducer

Claim 1

A PRECISION TRANSDUCER SENSITIVE TO THE ANGULAR DISPOSITION OF A ROTATABLE MEMBER, SAID TRANSDUCER COMPRISING: (A) A FIRST ELECTRICALLY NON-CONDUCTIVE DISK SECURED TO THE ROTATABLE MEMBER FOR ROTATION THEREWITH; (B) SECOND AND THIRD ELECTRICALLY NON-CONDUCTIVE DISKS FIXEDLY MOUNTED IN SEPARATE PLANES PARALLEL TO THE PLANE OF THE FIRST DISK; (C) A FOURTH ELECTRICALLY NON-CONDUCTIVE DISK POSITIONED IN A PLANE PARALLEL TO AND BETWEEN THE SECOND AND THIRD DISKS; (D) A FIFTH ELECTRICALLY NON-CONDUCTIVE DISK POSITIONED IN A PLANE PARALLEL TO AND BETWEEN THE FIRST AND THIRD DISKS, EACH OF THE FIVE RECITED DISKS HAVING A COMMON AXIS OF SYMMETRY; (E) MEANS FOR ROTATING THE FOURTH AND FIFTH DISKS IN UNISON AT A PREDETERMINED CONSTANT ANGULAR VELOCITY; (F) MEANS PROVIDING BOTH SIDES OF THE PERIPHERAL SURFACE OF THE THIRD DISK WITH A LAYER OF AN ELECTRICALLY CONDUCTIVE MATERIAL; (G) MEANS PROVIDING THE SURFACES OF THE FOURTH AND FIFTH DISKS ADJACENT THE THIRD DISK WITH A LAYER OF AN ELECTRICALLY CONDUCTIVE MATERIAL; (H) MEANS PROVIDING A FIRST PATTERN OF ELECTRICALLY CONON THE THIRD DISK TO GROUND; (I) MEANS PROVIDING A FIRST PATTERN OF ELECTRICALLY CONDUCTIVE MATERIAL ON THE SURFACE OF THE FIRST DISK ADJACENT THE FIFTH DISK, SAID FIRST PATTERN INCLUDING 1024 IDENTICAL EQUALLY SPACED BARS EACH CONNECTED TO A FIRST CIRCULAR BAND; (J) A SOURCE OF D.C. POTENTIAL CONNECTED TO FIRST CIRCULAR BAND; (K) MEANS PROVIDING A SECOND PATTERN OF ELECTRICALLY CONDUCTIVE MATERIAL ON THE SAID SURFACE OF THE FIRST DISKS, SAID SECOND PATTERN INCLUDING 25 IDENTICAL BARS EACH CONNECTED TO A SECOND CIRCULAR BAND WHICH IS CONCENTRIC WITH THE FIRST CIRCULAR BAND, THE SAID 25 BARS BEING SO SPACED ABOUT THE SECOND CIRCULAR BAND THAT WHEN A PATTERN IDENTICAL TO THE SECOND PATTERN IS PROVIDED ON THE ADJACENT SURFACE OF THE FIFTH DISK, THE 25 BARS OF THE JUXTAPOSED PATTERNS ARE DIRECTLY OPPOSITE ONE ANOTHER IN ONE AND ONLY ONE ROTATIONAL POSITION;