Photosensitive wire diameter gauge

Claim 1

A HIGHLY SENSITIVE WIDTH GAUGE FOR DETERMINING THE DISTANCE BETWEEN OPPOSITE LATERAL EDGES OF AN ELONGATED ARTICLE, WHICH IS MOVING IN THE DIRECTION OF ITS LONGITUDINAL AXIS, COMRPISING: AT LEAST ONE LIGHT SOURCE, POSITIONED ON ONE SIDE OF SAID ARTICLE SO AS TO ILLUMINATE AN AREA INCLUDING A PART OF EACH OF SAID LATERAL EDGES; TWO PHOTOSENSITIVE DEVICES ON THE SIDE OF THE ARTICLE REMOTE FROM SAID LIGHT SOURCE AND WITH THEIR PHOTOSENSITIVE SURFACES FACING SAID LIGHT SOURCE; EACH OF SAID PHOTOSENSITIVE DEVICES BEING OF THE TYPE WHICH PRODUCES AN OUTPUT VOLTAGE VARYING BY BOTH SIGN AND MAGNITUDE ACCORDING TO THE PART AND EXTENT OF THE PHOTOSENSITIVE SURFACE WHICH IS ILLUMINATED; ONE OF SAID PHOTOSENSITIVE DEVICES BEING SO POSITIONED AND ORIENTED RELATIVE TO ONE LONGITUDINAL EDGE OF SAID ARTICLE THAT MOVEMENT OF SAID ONE EDGE TOWARD AND AWAY FROM THE LONGITUDINAL CENTER LINE OF SAID ARTICLE CAUSES THE CHANGE IN THE OUTPUT VOLTAGE OF SAID ONE DEVICE TO HAVE A FIRST ELECTRICAL POLARITY AND A SECOND OPPOSITE ELECTRICAL POLARITY, RESPECTIVELY; THE OTHER OF SAID PHOTOSENSITIVE DEVICES BEING SO POSITIONED AND ORIENTED RELATIVE TO THE OTHER EDGE OF SAID ARTICLE THAT MOVEMENT OF SAID OTHER EDGE TOWARD AND AWAY FROM SAID ARTICLE CENTER LINE CAUSES THE CHANGE IN THE OUTPUT VOLTAGE OF SAID OTHER DEVICE TO HAVE A THIRD AND FOURTH ELECTRICAL POLARITY, RESPECTIVELY, SAID FOURTH POLARITY BEING OPPOSITE TO SAID THIRD POLARITY; VOLTAGE RESPONSIVE MEANS FOR INDICATING THE OUTPUT OF SAID PHOTSENSITIVE DEVICES; AND CIRCUIT MEANS CONNECTING SAID PHOTOSENSITIVE DEVICES TO SAID VOLTAGE RESPONSIVE INDICATING MEANS IN SUCH MANNER AS TO CAUSE SAID INDICATING MEANS TO RESPOND ONLY TO A PARTICULAR LINEAR ARITHMETIC COMBINATION OF SAID FIRST AND THIRD POLARITY VOLTAGES AND THE SAME LINEAR ARITHMETIC COMBINATION OF SAID SECOND AND FOURTH POLARITY VOLTAGES, BUT TO THE OPPOSITE LINEAR ARITHMETIC COMBINATION OF SAID FIRST AND SECOND POLARITY VOLTAGES AND OF SAID THIRD AND FOURTH POLARITY VOLTAGES; SAID PARTICULAR AND SAID OPPOSITE ARITHMETIC COMBINATIONS BEING SUCH THAT MOVEMENT OF BOTH SAID EDGES OF SAID ARTICLES TOWARD AND AWAY FROM SAID CENTER LINE CAUSE ADDITIVE EFFECT OF SAID OUTPUT VOLTAGES ON SAID INDICATING MEANS, BUT MOVEMENT OF EITHER OF SAID EDGES TOWARD SAID CENTER LINE WHILE SAID OTHER EDGES MOVES AWAY FROM SAID CENTER LINE CAUSES AN EFFECT ON SAID INDICATING MEANS PROPORTIONAL TO THE DIFFERENCE OF SAID OUTPUT VOLTAGES, SO THAT SAID INDICATING MEANS IS INSENSITIVE TO ANY TRANSVERSE MOVEMENT OF SAID ARTICLE BUT WILL INDICATE ANY ACTUAL CHANGE IN WIDTH OF SAID ARTICLE EVEN THOUGH IT BE MOVING TRANSVERSELY ALSO.