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SCIENCE STUDIES THE NEGRO SPIRITUAL FACIAL EXPRESSION

E&MP 89.007

Music Recording

no date

Legend - A sample record.

record of the singer's voice, are made by a tuning fork vibrating a hundred times a second and the line with the longest undulations represents his breathing

The short heavy waves are the record of the singer's voice, the higher waves are made by a tuning fork vibrating a hundred times a second and the line with the longest undulations represents his breathing.


Original Caption by Science Service



National Museum of American History

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