Phase meter calibrator

Claim 1

IN A DEVICE FOR MEASURING PHASE SHIFT IN A PLURALITY OF ELECTRICAL CIRCUITS THE COMBINATION COMPRISING FIRST AND SECOND INPUT MEANS FOR RECEIVING TWO INCOMING SIGNALS; PHASE SHIFT MEANS SERIALLY CONNECTED BETWEEN ONE OF SAID INPUT MEANS AND THE REMAINDER OF THE CIRCUIT FOR CHANGING THE PHASE OF THE SIGNAL INTO THE ONE INPUT MEANS BY A FIXED AMOUNT RELATIVE TO THE PHASE OF THE SIGNAL IN THE OTHER OF SAID INPUT MEANS; FIRST AND SECOND SQUARING AMPLIFIERS CONNECTED TO SAID FIRST AND SECOND INPUT MEANS FOR CONVERTING THE INPUT SIGNALS INTO SQUARE WAVES; FIRST AND SECOND CAPACITORS, EACH BEING OF LIKE VALUE AND SERIALLY CONNECTED IN THE INPUT OF SAID FIRST AND SECOND SQUARING AMPLIFIERS; A VARIABLE RESISTANCE HAVING ITS SLIDING CONTACT GROUNDED AND ITS ENDS CONNECTED TO THE INPUTS OF THE SQUARING AMPLIFIERS, SO THAT THE COMBINATION OF SAID CAPACITORS AND SAID VARIABLE RESISTANCE PROVIDES A VARIABLE LEAD TIME FOR ONE SQUARE WAVE RELATIVE TO THE OTHER SQUARE WAVE; AND DIGITAL COUNTER MEANS CONNECTED TO THE OUTPUT OF THE SQUARING AMPLIFIERS AND ACTUATED SEQUENTIALLY BY SAID SQUARE WAVES FOR MEASURING THE TIME INTERVAL BETWEEN LIKE POINTS ON THE SQUARE WAVES TO INDICATE THE PHASE DIFFERENCE BETWEEN THE TWO INCOMING SIGNALS AT THE FIRST AND SECOND INPUTS OF SAID DEVICE.