Interval timer

Claim 1

AN ELECTRICAL TIMING CIRCUIT COMPRISING: A TRIGGERING CIRCUIT INCLUDING A NORMALLY DISABLED GAS DIODE, A TIME CONSTANT NETWORK INCLUDING A RESISTOR AND CAPACITOR, SAID CAPACITOR BEING CONNECTED IN PARALLEL WITH SID GAS DIODE, A DIRECT CURRENT POWER SUPPLY FEEDING SAID TIME CONSTANT NETWORK WITH SUFFICIENT VOLTAGE AS CAUSE SAID GAS DIODE TO FIRE ATER A PREDETERMINED TIME INTERVAL, A LIGHT SENSITIVE DETECTOR COUPLED TO SAID DIODE TO PROVIDE A HIGHER POWERED OUTPUT, SAID LIGHT SENSITIVE DETECTOR CONNECTED AS ONE LEG OF AN ELECTRICAL BRIDGE, SAID BRIDGE COMPRISING RESISTANCES FOR THE OTHER THREE LEGS, A COIL OF AN ELECTROMECHANICAL DEVICE CONNECTED BETWEEN OPPOSITE PAIRS OF LEGS OF SAID BRIDGE, MEANS FOR MOMENTARILY SWITCHING A LOW IMPEDANCE ACROSS THAT LEG OF SAID BRIDGE WHICH IS ADJACENT TO SAID LIGHT SENSITIVE DETECTIVE LEG WHICH SAID TWO LEGS FORM A CIRCUIT PARALLEL TO SAID COIL, SAID SWITCHING MEANS CAUSING A BRIDGE IMBALANCE SUFFICIENT TO CAUSE SAID COIL TO BE FULLY ENERGIZED WHEN A DIRECT CURRENT VOLTAGE OF SUITABLE VALUE IS IMPRESSED UPON SAID BRIDGE, SAID LEGS AND SAID VOLTAGE BEING OF SUCH VALUE SO AS TO PROVIDE HOLDING CURRENT FOR SAID COIL WHEN SAID LIGHT SENSITIVE DETECTOR IS NOT ILLUMINATED AND TO PROVIDE NO HOLDING CURRENT OR A SMALL VALUE OF REVERSE CURRENT WHEN SAID LIGHT SENSITIVE DETECTOR IS ILLUMINATED, SECOND SWITCHING MEANS FOR MOMENTARILY CONNECTING SAID POWER SUPPLY TO SAID CIRCUIT, A THIRD SWITCHING MEANS FOR CONNECTING SAID POWER SUPPLY TO SAID CIRCUIT WHENERVER SAID COIL IS SUFFICIENTLY ENERGIZED.