Wiring tester including a standard unit and a selective switch means

Claim 1

A WIRING TESTER FOR CHECKING THE WIRING CONTINUITY IN AN ELECTRICAL UNIT UNDER TEST AGAINST THAT OF A STANDARD UNIT COMPRISING A VOLTAGE SOURCE, MEANS FOR ALTERNATELY CONNECTING ONE TERMINAL OF SAID VOLTAGE SOURCE TO A SELECTED TERMINAL ON SAID ELECTRICAL UNIT UNDER TEST AND A CORRESPONDING SELECTED TERMINAL ON SAID STANDARD UNIT AT A FREQUENCY OF APPROXIMATELY 5 CYCLES PER SECOND, AND DISPLAY LAMP MEANS CONNECTED IN SERIES WITH SAID STANDARD UNIT AND SAID UNIT UNDER TEST FOR PRODUCING A VISUAL DISPLAY INDICATIVE OF THE CORRESPONDENCE OR NON-CORRESPONDENCE BETWEEN THE WIRING IN SAID UNIT UNDER TEST AND SAID STANDARD UNIT, THE OTHER TERMINAL OF SAID VOLTAGE SOURCE BEING CONNECTED TO SAID DISPLAY LAMP MEANS WHICH COMPRISES A PLURALITY OF NEON LAMPS, A SUBSTANTIALLY STEADY STATE OF SAID LAMPS BEING INDICATIVE OF CORRESPONDENCE BETWEEN THE WIRING OF SAID STANDARD UNIT AND SAID UNIT UNDER TEST AND A FLICKERING OF ONE OF SAID LAMPS BEING INDICATIVE OF NONCORRESPONDENCE THEREBETWEEN.