Oscillograph control

Claim 1

A SYSTEM FOR RECORDING TRANSIENT WAVE PHENOMENA IN THE OUTPUT OF A WAVE SOURCE COMPRISING A RECORDING OSCILLOGAPH INCLUDING A GALVANOMETER AND A LIGHT-SENSITIVE RECORDING APPARATUS, MEANS INCLUDING A TIME DELAY CIRCUIT FOR CONNECTING SAID GALVANOMETER TO THE WAVE SOURCE WHEREBY SAID GALVANOMETER IS ENERGIZED CONTINUOUSLY BY THE SOURCE TO VIBRATE THEREWITH, SAID DELAY CIRCUIT COMPRISING A PLURALITY OF EQUAL IMPEDANCE ELEMENTS CONNECTED IN SERIES BETWEEN INPUT AND OUTPUT TERMINALS EACH ELEMENT CONSISTING OF A RESISTANCE AND AN INDUCTANCE CONNECTED IN PARALLEL, A REFERENCE POTENTIAL CONDUCTOR, EACH OF THE CONNECTIONS BETWEEN ADJACENT ONES OF SAID IMPEDANCE ELEMENTS BEING CONNECTED TO SAID CONDUCTOR THROUGH A RESPECTIVE CAPACITOR, SAID INDUCTANCES HAVING CENTER TAPS, EACH OF SAID CENTER TAPS BEING CONNECTED TO SAID CONDUCTORS HAVING THE SAME CAPACITANCE, TWO CAPACITORS CAPACITORS HAVING THE SAME CAPACITANCE, TWO CAPACITORS EACH OF ONE-HALF THE CAPACITANCE OF SAID FIRST MENTIONED CAPACITORS AND CONNECTED BETWEEN A RESPECTIVE ONE OF SAID TERMINALS AND SAID CONDUCTOR, AND MEANS RESPONSIVE TO A PREDETERMINED TRANSIENT CONDITION OF SAID SOURCE FOR STARTING SAID RECORDING APPARATUS WHEREBY SAID APPARATUS RECORDS CONTINUOUSLY THE CONDITION OF SAID SOURCE AND THOSE EVENTS WHICH OCCURED AT AN INTERVAL OF TIME PRIOR TO THE STARTING OF SAID APPARATUS.