Audio system for instructing an operator in the performance of continuity testing

Claim 1

IN AN APPARATUS FOR INSTRUCTING A HUMAN OPERATOR TO MAKE A PLURALITY OF ELECTRICAL CONTINUITY TESTS BETWEEN SELECTED TERMINALS OF A UNIT; A MAGNETIC TAPE HAVING A PLURALITY OF RECURING AUDIBLE INSTRUCTION SIGNALS, INAUDIBLE CONTROL SIGNALS AND AUDIBLE CONTINUITY INDICATING SIGNALS SUCCESSIVELY RECORDED THEREON; A TAPE PLAYBACK MACHINE FOR TRANSPOSING SAID RECORDED SIGNALS INTO ELECTRICAL SIGNALS; A POWER SUPPLY MEANS CONNECTED TO SAID MACHINE FOR ENERGIZING SAID MACHINE TO GENERATE THE SIGNALS; MEANS FOR RENDERING ONLY SAID AUDIBLE ELECTRICAL SIGNALS INTELLIGIBLE TO A HUMAN OPERATOR; MEANS RESPONSIVE TO SAID INAUDIBLE ELECTRICAL CONTROL SIGNALS FOR INTERRUPTING SAID POWER SYPPLY MEANS TO DEENERGIZE SAID MACHINE; CIRCUIT MEANS HAVING A PAIR OF PROBES FOR CONNECTION BY THE OPERATOR TO SELECTED TERMINALS OF THE UNIT UNDER TEST IN ACCORDANCE WITH SAID AUDIBLE INSTRUCTIONS SIGNALS; AND MEANS ACTUATED BY THE CONNECTION OF SAID PROBES TO SAID TERMINALS AND ONLY RESPONSIVE TO A CLOSED CIRCUIT BETWEEN SAID PROBES FOR RENDERING EFFECTIVE SAID POWER SUPPLY MEANS TO REENERGIZE SAID MACHINE TO PRODUCE SAID AUDIBLE CONTINUITY INDICATING SIGNALS TO INDICATE TO THE OPERATOR THAT THE TERMINALS TESTED ARE ACCEPTABLE.