R.p.m. dwell angle and point resistance tester

Claim 1

APPARATUS FOR MEASURING DWELL ANGLE OF BREAKER POINTS IN AN IGNITION SYSTEM HAVING A SOURCE OF ELECTRICAL ENERGY CONNECTED IN CIRCUIT WITH SUCH BREAKER POINTS; SAID APPARATUS INCLUDING A RELAY MEANS, AN INDICATOR, A CAPACITOR MEANS, A LOCAL BATTERY, AN IMPEDANCE ELEMENT AND TEST LEAD MEANS CONNECTABLE ACROSS BREAKER POINTS UNDER TEST; SAID RELAY MEANS INCLUDING A FIRST NORMALLY CLOSED AND A SECOND NORMALLY OPEN CONTACT SECTION AND AN OPERATING COIL WHICH WHEN ENERGIZED OPENS SAID FIRST CONTACT SECTION AND CLOSES SAID SECOND CONTACT SECTION; SAID TEST LEAD MEANS CONNECTED TO SAID COIL FOR ENERGIZATION OF THE LATTER BY A SOURCE OF ELECTRICAL ENERGY EXTERNAL OF SAID APPARATUS AND IN CIRCUIT WITH BREAKER POINTS UNDER TEST WHEN SUCH BREAKER POINTS ARE OPEN AND SAID TEST LEAD MEANS ARE CONNECTED THEREACROSS; CIRCUIT MEANS INCLUDING A FIRST CIRCUIT FOR DISCHARGING SAID CAPACITOR MEANS THROUGH SAID INDICATOR WHEN SAID COIL IS DEENERGIZED; SAID FIRST CIRCUIT INCLUDING SAID FIRST CONTACT SECTION; SAID CIRCUIT MEANS ALSO INCLUDING A SECOND CIRCUIT FOR DISCHARGING SAID LOCAL BATTERY THROUGH SAID INDICATOR WHEN SAID COIL IS DEENERGIZED; SAID SECOND CIRCUIT INCLUDING SAID IMPEDANCE ELEMENT AND BEING EXCLUSIVE OF SAID CAPACITOR MEANS WITH SIMULTANEOUS DISCHARGES FROM BOTH SAID CAPACITOR MEANS AND SAID LOCAL BATTERY CONTRIBUTING SIGNIFICANTLY TO CONTROL OPERATION OF SAID INDICATOR; A PORTION OF SAID CIRCUIT MEANS, INCLUDING SAID SECOND CONTACT CONNECTION, CONNECTING SAID CAPACITOR MEANS TO CHARGE FROM ENERGY SUPPLIED BY SAID LOCAL BATTERY WHEN SAID COIL IS ENERGIZED.