Audio-visual instructional apparatus

Claim 1

AN AUDIO-VISUAL APPARATUS FOR USE AS AN INSTRUCTIONAL AID COMPRISING IN COMBINATION: AN ELECTRICALLY OPERATED SOUND REPRODUCING MECHANISM FOR REPRODUCING THE SOUND FROM A MULTI-CHANNEL RECORDING ONE CHANNEL OF WHICH CARRIES AUDIBLE SOUND MODULATIONS AND A SOUND CHANNEL OF WHICH CARRIES INAUDIBLE SIGNAL MODULATIONS, SAID SOUND REPRODUCING MECHANISM INCLUDING A PICK-UP HEAD FOR EACH CHANNEL AND A FIRST AMPLIFIER FOR AMPLIFYING SOUND FROM THE AUDIBLE CHANNEL AND A SECOND AMPLIFIER FOR AMPLIFYING THE INAUDIBLE SIGNAL MODULATIONS FROM THE OTHER CHANNEL, SAID RECORDING BEING IN THE FORM OF A RECORD DISK WHICH MAY SUITABLY BE MOUNTED ON A TURNTABLE THAT IS CONTROLLABLY DRIVEN BY AN ELECTRIC MOTOR WHEN A RECORD IS IN PLACE SO THAT A TONE ARM HAVING A PICK-UP HEAD AND A RECORD ENGAGING STYLUS MOUNTED ADJACENT SAID TURNTABLE IS ADAPTED UPON ROTATION TO TRACK THE GROOVES OF SAID RECORD DISK FROM THE INITIAL PLAYING POSITION TO THE FINAL PLAYING POSITION WHEREBY SAID SOUND IS REPRODUCED; AN ELECTRICALLY OPERATED PROJECTION MECHANISM FOR PROJECTING IMAGES FROM A MULTI-FRAME FILM STRIP TO A SCREEN AND INCLUDING AT LEAST ONE LIGHT SOURCE FOR ILLUMINATING SAID STRIP, A FILM SUPPORTING HAVING AN APERTURE AND FEED MEANS FOR ADVANCING THE FILM STRIP ONE FRAME AT A TIME AND EXPOSING AN INDIVIDUAL FRAME OF SAID FILM AT SAID APERTURE AND AN OCCLUDING SHUTTER SHIFTABLE BETWEEN AN IMAGE-OCCLUDING POSITION IN WHICH THE IMAGE IS OCCLUDED FROM SAID SCREEN AND AN IMAGE-EXPOSING POSITION IN WHICH THE PROJECTED IMAGE IS EXPOSED TO SAID SCREEN AND VIEW; AND ELECTRICALLY OPERATED MEANS IN THE FORM OF ELECTRICAL CIRCUITRY INTERCONNECTED BETWEEN THE SECOND AMPLIFIER OF THE SOUND REPRODUCTION MECHANISM AND THE FEED MEANS AND OCCLUDING SHUTTER OF THE PROJECTION MECHANISM SO AS TO CONTROL THE OPERATION OF THE FEED MEANS AND OCCLUDING SHUTTER AND CAUSES ADVANCE OF THE FILM AND EXPOSURE OF THE IMAGE TO VIEW IN RESPONSE TO SIGNALS FROM THE SECOND CHANNEL OF THE SOUND RECORDING.