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Scientific American, Vol. 40, No. 14 (April 1879) (1879)

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An illustration from Scientific American, Vol. 40, No. 14 (April 1879), 1879, leaf 0
on pivots in 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 having a mouthpiece and stop cock at its free… … NEW INSTRUMENT FOR CONCENTRATING AND PROJECTING SOUNDS. ©1879 SCIENTIFIC AMERICAN, INC.

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