Device for grading test papers

Claim 1

A MACHINE FOR GRADING THE ANSWER PAPER TO A TEST WHEREIN THERE ARE A MULTIPLE CHOICE OF ANSWERS TO EACH TEST QUESTION, AND THE CHOSEN ANSWERS ARE INDICATED BY MARKING SELECTED AREAS OF THE ANSWER PAPER WITH ELECTRICALLY CONDUCTIVE MATERIAL, SAID MACHINE COMPRISING, FOR EACH QUESTION TO BE GRADED: (A) AN ELECTRICALLY-OPERATED INDICATING DEVICE, (B) A PLURALITY OF PAIRS OF SPACED PROBES, (C) SWITCH MEANS COMPRISING A PLURALITY OF MOVABLE CONTACTS CONNECTED TO BE MOVABLE TOGETHER, AND A PLURALITY OF FIXED CONTACTS, SAID MOVABLE CONTACTS BEING ADJUSTABLE SELECTIVELY TO CONNECT AT LEAST ONE PAIR OF SAID PROBES IN SERIES WITH CERTAIN OF SAID FIXED CONTACTS AND TO CONNECT OTHERS OF SAID PAIRS OF PROBES IN PARALLEL WITH OTHER OF SAID FIXED CONTACTS, THEREBY TO ADJUST THE MACHINE FOR INDICATING THE CORRECT AND INCORRECT ANSWERS, RESPECTIVELY, TO THE QUESTION, (D) ELECTRIC CIRCUIT MEANS CONNECTING SAID FIXED CONTACTS TO SAID INDICATING DEVICE AND OPERATIVE WHEN AN ANSWER PAPER IS ARRANGED IN POSITION IN THE MACHINE AND A CONDUCTIVE AREA THEREON IS DISPOSED IN ELECTRICALLY CONDUCTIVE REGISTRY WITH SAID ONE PAIR OF SAID PROBES TO EFFECT OPERATION OF SAID INDICATING DEVICE IN A FIRST MANNER, AND OPERATIVE WHEN A CONDUCTIVE AREA IS DISPOSED IN ELECTRICALLY-CONDUCTIVE REGISTRY WITH ONE OF SAID OTHER PAIR OF PROBES TO EFFECT A DIFFERENT OPERATION OF SAID INDICATING DEVICE, WHEREBY A CORRECT AS WELL AS A WRONG ANSWER TO A QUESTION MAY BE INDICATED, (E) SAID INDICATING DEVICE COMPRISING A LAMP, AND MEANS FOR MAINTAINING SAID LAMP NORMALLY ILLUMINATED, AND (F) SAID ELECTRIC CIRCUIT MEANS IN ITS TWO MANNERS OF OPERATION COMPRISING MEANS FOR TURNING OFF SAID LAMP, AND FOR INCREASING ITS BRILLIANCY, RESPECTIVELY.