Selecting apparatus

Claim 1

APPARATUS FOR COMPARING A FIRST ELEMENT HAVING A PLURALITY OF LIGHT PASSING AREAS ARRANGED IN A SIGNIFICANT PATTERN WITH A SECOND ELEMENT HAVING A PLURALITY OF LIGHT PASSING AREAS ALSO ARRANGED IN A SIGNIFICANT PATTERN, SAID APPARATUS INCLUDING A BODY OF PHOTOCONDUCTIVE MATERIAL HAVING SERIES OF PHOTOCONDUCTIVE AREAS ARRANGED IN SEQUENCE THEREALONG, MEANS FOR HOLDING SAID TWO ELEMENTS AT TWO DIFFERENT SIDES OF SAID BODY OF PHOTOCONDUCTIVE MATERIAL, MEANS FOR PASSING LIGHT FROM ONE OF SAID SIDES THROUGH SAID LIGHT PASSING AREAS OF THE FIRST OF SAID ELEMENTS AND ONTO CORRESPONDING ONES OF SAID PHOTOCONDUCTIVE AREAS, MEANS FOR PASSING LIGHT FROM THE OTHER OF SAID SIDES THROUGH SAID LIGHT PASSING AREAS OF THE SECOND ELEMENT AND ONTO CORRESPONDING ONES OF SAID PHOTOCONDUCTIVE AREAS, SAID TWO LAST MENTIONED MEANS BEING CONSTRUCTED TO PASS LIGHT ESSENTIALLY SIMULTANEOUSLY THROUGH SAID LIGHT PASSING AREAS OF BOTH OF SAID ELEMENTS AND ONTO THE SAME ONE OF SAID PHOTOCONDUCTIVE AREAS IN INSTANCES IN WHICH THE TWO ELEMENTS HAVE CORRESPONDINGLY POSITIONED LIGHT PASSING AREAS, AND ELECTRICAL CIRCUITRY CONNECTED TO SAID PHOTOCONDUCTIVE BODY AND RESPONSIVE TO THE LIGHT ACTUATION THEREOF, SAID CIRCUITRY INCLUDING MEANS FORMING AN ELECTRICAL SERIES CIRCUIT THROUGH SAID PHOTOCONDUCTIVE AREAS AND RESPONSIVE TO LIGHT ACTUATION OF ALL OF SAID AREAS TO PASS CURRENT THROUGH SAID SERIES CIRCUIT.