Analog-to-digital converter

Claim 1

AN ANALOG-TO-DIGITAL CONVERTER COMPRISING A 2**0 HAVING EQUAL AND ALTERNATING CLEAR AND OPAQUE SEGMENTS, A 2**2 TRACK HAVING EQUAL AND ALTERNATING CLEAR AND OPAQUE SEGMENTS, EACH OF SAID 2**2 SEGMENTS BEING ANGULARY COEXTENSIVE WITH FOUR CONTIGUOUS SEGMENTS OF SAID 2**0 TRACK, A 2**0 PHOTORESISTOR SENSOR ASSOCIATED WITH SAID 2**0 TRACK AND LOCATED ON A RADIAL REFERENCE LINE, FIRST, AND SECOND, THIRD AND FOURTH 2**2 PHOTORESISTOR SENSORS ASSOCIATED WITH SAID 2**2 TRACK, EACH OF SAID FOUR PHOTORESISTOR SENSORS BEING LOCATED WITH REFERENCE TO SAID RADIAL REFERENCE LINE OR A RADIAL REFERENCE LINE DISPLACED AN EVEN MULTIPLE OF 2**2 TRACK SEGMENTS THEREFROM, SAID FIRST 2**2 SENSOR BEING LOCATED ONE-EIGHTH OF A 2**2 TRACK SEGMENT WIDTH ON ONE SIDE OF A RADIAL REFERENCE LINE, SAID SECOND, THIRD AND FOURTH 2**2 SENSORS BEING LOCATED RESPECTIVELY AT ONE-EIGHTHS AND FIVE-EIGHTS OF A 2**2 TRACK SEGMENT WIDTH ON THE OTHER SIDES OF RADIAL REFERENCE LINES, LIGHT SOURCE MEANS POSITIONED TO DIRECT LIGHT THROUGH SAID TRACKS TO SAID SENSORS, MEANS TO ELECTRICALLY ENERGIZE SAID 2**0 SENSOR, A FLIP-FLOP RESPONSIVE TO SAID 2**0 SENSOR AND HAVING A 2**0 OUTPUT ALSO CONNECTED TO ELECTRICALLY ENERGIZED SAID FIRST AND THIRD 2**2 SENSORS AND HAVING A COMPLEMENT OUTPUT CONNECTED TO ELECTRICALLY ENERGIZE SAID SECOND AND FOURTH 2**2 SENSORS, AN EXCLUSIVE "OR" GATE HAVING AN INPUT RESPONSIVE TO SAID FIRST AND SECOND SENSORS, HAVING ANOTHER INPUT RESPONSIVE TO SAID THIRD AND FOURTH SENSORS AND HAVING A 2**1 OUTPUT, AND MEANS RESPONSIVE TO EITHER ONE OF SAID FIRST AND SECOND SENSORS TO PROVIDE A 2**2 OUTPUT.