Imperfection counter

Claim 1

APPARATUS ADAPTED TO COUNT IMPERFECTIONS IN MATERIAL IN THE FROM OF YARN AND THE LIKE, SAID IMPEPFECTIONS BEING OF THE ORDER OF 1/16 INCH OR LESS IN LENGTH AS MEASURED ALONG THE LENGTH OF SAID MATERIAL, SAID APPARATUS INCLUDING MEANS FOR DEVELOPING SIGNALS CORRESPONDING TO THE IMPERFECTIONS, SAID SIGNALS BEING OF RANDOM TIMESPACING AND WIDE RANGE OF AMPLITUDES AND HAVING COMPONENTS RESPRESENTING SAID IMPERFECTIONS AND ALSO COMPONENTS REPRESENTING LONGER VARIATIONS IN THE MATERIAL A DIFFERENTIATING CIRCUIT INCLUDING AS ELEMENTS A COUPLING CONDENSER AND A RESISTOR ON WHICH ALL OF SAID SIGNALS AND COMPONENTS ARE IMPRESSED, SAID ELEMENTS BEING PROPORTIONED TO PASS SUBSTANTIALLY ONLY THE SHORT COMPONENTS AND TO REJECT THE LONGER COMPONENTS, A RECTIFIER CONNECTED TO RECEIVE THE DIFFERENTIATED SIGNALS AND POLARIZED TO DISCRIMINATE AGAINST RETURN TRACE SIGNALS FORMED BY THE DIFFERENTIATING CIRCUIT, AN AMPLIFIER COUPLED TO THE OUTPUT OF SAID RECTIFIER FOR INCREASING THE AMPLITUDE OF SAID SHORT COMPONENTS, THE SIGNALS AT THE OUTPUT OF SAID AMPLIFIER BEING OF SUBSTANTIALLY POSITIVE POTENTIAL, COUNTING MEANS FOR AUTOMATICALLY COUNTING SAID SHORT COMPONENTS, AND MEANS FOR IMPRESSING SAID POSITIVE AMPLIFIED SIGNALS ON SAID COUNTING MEANS, SAID COUNTING MEANS INCLUDING MEANS FOR FORMING SAID AMPLIFIED SIGNALS INTO PULSES AND FOR COUNTING THE PULSES, MEANS FOR ESTABLISHING A SIGNALVOLTAGE THRESHOLD AT WHICH SAID COUNTING MEANS BECOMES OPERATIVE WHICH INCLUDES A SOURCE OF UNDIRECTIONAL NEGATIVE POTENTIAL, MEANS FOR ADJUSTING THE MAGNITUDE OF SAID POTENTIAL, AND MEANS FOR IMPRESSING THE ADJUSTED NEGATIVE POTENTIAL ON THE INPUT OF SAID COUNTING MEANS.