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large wheel winds up the film after it has been exposed, while the smaller objects are for recording the voice and the motions of the chest by a moving beam of light

RECORDING DEVICE

E&MP 89.004

Music Recording

no date

Legend - Interior of the apparatus.

The large wheel winds up the film after it has been exposed, while the smaller objects are for recording the voice and the motions of the chest by a moving beam of light.


Original Caption by Science Service



National Museum of American History

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