Phonometer

From Wikipedia, the free encyclopedia

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.

References[edit]

  • This article incorporates text from a publication now in the public domainBeach, Chandler B., ed. (1914). "Phonometer" . The New Student's Reference Work . Chicago: F. E. Compton and Co.

External links[edit]

  • The dictionary definition of phonometer at Wiktionary