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{{Filmjr |title=Sound Recording and Reproduction (Sound on Film) |embid=SoundRec1943 |embsv=archiveorg |desc=HOW MICROPHONE TRANSFORMS KINETIC ENERGY OF AIR WAVES INTO ELECTRICAL ENERGY; HOW FLUCTUATIONS IN ELECTRIC CURRENT OPERATE PHOTOGRAPHIC LIGHT VALVE WHICH REGISTERS THEIR FLUCTUATIONS THRU VARYING LIGHT BEAM UPON SENSITIZED PHOTOGRAPHIC FILM; REVERSE. VARIABLE AREA & VARIABLE DENSITY SOUND TRACKS EXPLAINED & DEMONSTRATED. SOUND FILM PROJECTORS. Best scenes: 1) The narrator actually speaking the soundtrack to the film in real time, and 2) the end, where you can "see" a soundtrack. 06:42:11:00 - 06:43:05:00 VS man transferring motion-picture film from one reel to another; CU individual frames on film picturing woman, arrow pointing to her; arrow points to optical soundtrack on film; picture negative and sound negative side-by-side; diagram showing how negatives combine to create positive 06:43:05:00 - 06:47:23:00 VS man sitting at desk, talking into microphone (this is James A. Brill, the narrator for all of the ERPI Classroom Films, speaking); animated sound waves emitting from man's mouth to microphone; CU sound waves going into microphone; VS diagraming how sound moves from microphone to amplifier to recorder and onto sound track strip; VS diagramming various kinds of sound track strips and how light passes through; VS diagramming sound from amplifier to loudspeaker 06:47:24:00 - 06:50:39:00 Diagram of parts of light valve: ribbons, light slot, bridges, tensioning means; CU man looking through microscope; diagram of light valve ribbons (as seen through microscope); VS diagram of lens, apertures and ribbon slots, lens system and film; VS parts of light valve 06:50:39:00 - 06:51:03:00 MCU balding man with glasses, sitting behind desk talking toward microphone 06:51:03:00 - 06:52:26:00 Diagram what different types of soundtracks (variable density and varible area) look like as they run |forma=16mm |year=1943 |up=|next=|prev=|step=2 |lang=English |pbrs=Encyclopaedia Britannica Films |heldby=PA |len=10:15 |link= |bw= |ani= |ewid= }}

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