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acoustic Address system amperes amplifier Amplion aperture apparatus battery blimp broadcast camera carbon Chicago CHICAGO GEAR Cineglow circuit coil color Company condenser connected Corp decibels designed device diaphragm direct current disc effect Electric exciter lamp feet field filament film frequency grid horn impedance inches industry input installation Laboratories lens light valve loudspeaker machine manufacturers ment meter micro microphone motion picture motor mounted noise ohms operation optical output panel photoelectric cell pickup placed portable position potentiometer produced Projection Engineering projectionist projector public-address RACON radio radiovision RCA Photophone rectifier resistance resistor rheostat ribbon screen Selsyn sound equipment sound film sound pictures sound recording sound reproducing sound reproduction sound system sound track sound-on-film speaker speed sprocket stage standard studio supply switch talkie television theatre tion transformer transmitter tube ture unit vacuum tube voltage volume control wire