Time-controlled signal actuated switch for a slide projector

Claim 1

FOR OPERATING A SLIDE PROJECTOR IN RESPONSE TO RESPONSE TO RECORDED SIGNALS, AND RECORDING SAID SIGNALS, A UNITARY MECHANISM TO BE CONNECTED WITH SAID SLIDE PROJECTOR AND WITH A RECORDING MEANS, SAID UNITARY MECHANISM COMPRISING: SIGNAL GENERATING MEANS; A CONTROL CIRCUIT MEANS INCLUDING A RESISTANCE AND CAPACITANCE TIMING CIRCUIT THEREIN, SAID CONTROL CIRCUIT MEANS BEING CONNECTED TO SAID SIGNAL GENERATING MEANS TO OPERATE SAID SIGNAL GENERATING MEANS FOR A PREDETERMINED TIME INTERVAL; AMPLIFIER MEANS RESPONSIVE TO SIGNALS FROM EXTERNAL SOURCES; RECTIFYING MEANS CONNECTED TO SAID AMPLIFIER MEANS TO PROVIDE A CONTROL SIGNAL IN RESPONSE TO SAID SIGNALS FROM EXTERNAL SOURCES; AND SWITCHING MEANS CONNECTED TO SAID SIGNAL GENERATING MEANS, SAID CONTROL CIRCUIT MEANS AND SAID RECTIFIER MEANS FOR SELECTIVELY APPLYING SAID RESPECTIVE SIGNALS TO A RECORDING MEANS OR TO SAID CONTROL CIRCUIT MEANS WHEREBY SAID SLIDE PROJECTOR IS OPERATED SIMULTANEOUSLY WITH SAID SIGNALS FROM SAID EXTERNAL SOURCES OR WITH SAID SIGNAL GENERATING MEANS.