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instead of creating sound through vibrating a hard crystal, these sound vibrations are reflected by a mirror on a beam of light to a photo-electric cell

RECORD REPRODUCTION

E&MP 93.019

Phonograph

no date

Here's how Philco engineers have applied a new principle to record reproduction.

For the first time, instead of creating sound through vibrating a hard crystal, these sound vibrations are reflected by a mirror on a beam of light to a photo-electric cell.

Original Caption by Science Service
© Philco Corporation



National Museum of American History

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