Photo shows two men on a studio set. Man on left is adjusting the lights and the other is adjusting a microphone. Because of the extreme sensitivity of the microphone used in voice recordings, it is necessary to use incadescent lamps for lighting the "set" and players. Ordinary arc and mercury lights emit a slight spluttering that would sound like the crash of thunder when heard on the screen. Photo dated: August 31, 1928.
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