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Scientific American, Vol. 40, No. 14 (1879) (1879)
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of sound at a swiveled support, and is provided with a flexible tube single point. The same device may also be applied to an sound that naturally strikes the ear will be concentrated, ren- dering audible sounds that might otherwise be too distant or auditorium to project the voice of the speaker in… … © 1879 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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