Control and indication apparatus

Claim 1

IN AN ELECTRICAL NETWORK CIRCUIT, CONDITION RESPONSIVE MEANS PROVIDING A LOW VOLTAGE LOW CURRENT DIRECT CURRENT OUTPUT HAVING A VOLTAGE MAGNITUDE BETWEEN TWO OUTPUT TERMINALS DEPENDING UPON A MAGNITUDE OF A CONDITION, A SWITCHING DEVICE HAVING A FIRST AND SECOND CIRCUIT ALTERNATELY CLOSED, SAID CIRCUITS BEING CLOSED AT A FIXED FREQUENCY, CIRCUIT MEANS FOR SEPARATELY CONNECTING SAID OUTPUT TERMINALS TO SAID CIRCUITS, A CAPACITOR, A TERMINAL, A RESISTANCE, AN ELECTRICAL GROUND, CIRCUIT MEANS CONNECTING SAID CAPACITOR, SAID TERMINAL, SAID RESISTANCE, IN A SERIES CIRCUIT WITH SAID FIRST AND SECOND CIRCUITS TO SAID GROUND IN THE ORDER NAMED, FIRST AND SECOND CAPACITORS, CIRCUIT MEANS CONNECTING SAID FIRST CAPACITOR BETWEEN ONE OF SAID OUTPUT TERMINALS AND GROUND AND SAID SECOND CAPACITOR BETWEEN ANOTHER OF SAID OUTPUT TERMINALS AND GROUND, VOLTAGE AMPLIFYING MEANS HAVING AN INPUT TERMINAL AND AN OUTPUT, FURTHER MEANS ADAPTED TO BE ENERGIZED AND CONNECTED TO SAID OUTPUT, AND CIRCUIT MEANS CONNECTING SAID TERMINAL TO SAID INPUT TERMINAL WHEREBY UPON AN A.C. VOLTAGE BEING PROVIDED BY ALTERNATELY CHARGING SAID CAPACITOR FROM SAID CONDITION RESPONSIVE MEANS SAID FURTHER MEANS IS ENERGIZED INDICATIVE OF SAID CONDITION.