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Electricity and Electronics
Sound and Acoustics
27 other sections not shown
2x2 slides adjusted alternating current amplifier aperture audio audiovisual equipment auditorium automatic battery Brand and model bright camera cartridge cassette checked chines circuit classroom cleaning color composite video decibels device diameter diazo disc distance electrical electrons exposure film filmstrip focal length footcandles frequency fresnel lens glass groove heat illumination inches jectors lantern slide projectors light loudspeaker machine magnetic materials Mediaware meters microphone motion picture motor mounted moved movie projectors needed needle noise opaque opaque projector operation optical system ordinarily output overhead projector paper plastic playback plug portable power cord pressure produce projection lamps projection lens record player reel to reel reflector require result screen image shown in figure signal Silicon-controlled rectifiers slide projectors solder speaker speed splicing sprocket holes standard super-8 surface switch take-up reel tape recorders television threading tion transparencies usually various voltage volts watts wire zoom