Projection engineering (Jan 1932-Mar 1933)

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IN THIS ISSUE ENS FOR SOUND PICTURES By Gordon S. Mitchell MICROPHONE IN PUBLICADDRESS SYSTEMS By Charles Felstead JND TRANSMISSION FOR THE HARD OF HEARING By Henry L. Williams ;ational and commercial lms with sound-on-disc By Roger W. Fenimore .D'S LARGEST PUBLIC-ADDRESS JD PROGRAM DISTRIBUTING SYSTEM By J. J. Kuhn Fourth Year Of Service # \aj? \sjll \ ILs** VI/UAL ■ Photo, Courtesy RCA Institutes, Inc., New York View of Screen and Large Horn used in Sound Amplification Course. ■■H ssvSfii 5M24 EE9_ I journal of the Sound and Lignt Projection Industries APRIL, 193'