Ignition testing system for selectively testing spark pulse, condenser, coil, r. p. m., and circuit continuity

Claim 1

AN IGNITION SYSTEM TESTER INCLUSIVE OF SINGLE CYLINDER INTERNAL COMBUSTION ENGINES COMPRISING AN INDICATOR MEANS, A FIRST METERING CIRCUIT MEANS INCLUDING A FIRST AND A SECOND TEST LEAD ADAPTED TO BE CONNECTED, RESPECTIVELY, TO A HIGH TENSION LEAD AND TO A GROUNDED PORTION OF AN ENGINE UNDER TEST, AND A MULTI-POSITION SWITCH MEANS WHICH, IN A SECOND POSITION THEREOF, OPERATIVELY CONNECTS SAID FIRST METERING CIRCUIT MEANS IN CIRCUIT WITH SAID INDICATOR MEANS; SAID FIRST METERING CIRCUIT MEANS ALSO INCLUDING A CAPACITOR AND A DIODE CONNECTED IN SERIES COMBINATION AND FIRST MEANS OPERATIVELY CONNECTING SAID COMBINATION TO SAID FIRST TEST LEAD WHEREBY A SINGLE SHORT DURATION HIGH TENSION PULSE PRODUCED BY AN ENGINE IGNITION SYSTEM IN SATISFACTORY OPERATING CONDITION AND APPEARING AT SAID FIRST TEST LEAD WILL RESULT IN A VISUAL INDICATION APPEARING UPON SAID INDICATOR MEANS FOR AN INTERVAL OF TIME SUFFICIENTLY LONG TO OBTAIN A VISUAL READING; SAID TESTER ALSO COMPRISING MEANS FOR PRODUCING A REGULATED D.C. POTENTIAL DERIVED FROM AN A.C. SOURCE, AND CONTROL MEANS INCLUDING A THYRATRON CONNECTED TO SAID D.C. POTENTIAL; SAID FIRST TEST LEAD CONNECTED TO A CONTROL ELEMENT OF SAID THYRATRON; A SECOND METERING CIRCUIT MEANS INCLUDING AN IMPEDANCE ELEMENT SERIALLY CONNECTED BETWEEN SAID THYRATRON AND SAID D.C. POTENTIAL; SAID SWITCH MEANS BEING SELECTIVELY OPERABLE TO A THIRD POSITION WHEREBY SAID INDICATOR MEANS IS OPERATIVELY CONNECTED IN CIRCUIT WITH SAID SECOND METERING CIRCUIT MEANS WHEREBY AN INDICATION OF CURRENT FLOW