overall: 8 1/8 in x 3 7/8 in; 20.6375 cm x 9.8425 cm
Object Name:
phonelescope
Description:
This instrument, which allows one to see the wave forms of sound or electricity, was devised by Herbert Grove Dorsey (1876-1961), an American physicist and engineer. The inscription, in raised letters on the base, reads “PHONELESCOPE.”
Ref: Herbert Grove Dorsey, “Device for Graphically Reproducing Sound Waves,” U.S. Patent 1,017,392 (Feb. 13, 1912).
Herbert Grove Dorsey, “The Phonelescope,” <i>Journal of the Optical Society of America</i> 6 (1922): 279-280.
