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Phonometer
Instrument used to measure the force of the human speaking voice From Wikipedia, the free encyclopedia
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A phonometer is an instrument invented by Thomas Edison for testing the force of the human voice in speaking. It consists chiefly of a mouthpiece and diaphragm. Behind the diaphragm is placed a delicate mechanism which operates a 15-inch flywheel by means of which a hole can be bored in an ordinary pine board.
 | This article relies largely or entirely on a single source. (March 2025) |
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