Engineering:Phonometer: Difference between revisions
From HandWiki
imported>WikiG (over-write) |
(No difference)
|
Latest revision as of 10:42, 17 February 2022
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
This article incorporates text from a publication now in the public domain: Beach, Chandler B., ed (1914). "Phonometer". The New Student's Reference Work. Chicago: F. E. Compton and Co.
External links
 |  |
