| 释义 |
opeidoscope|əʊˈpaɪdəskəʊp|
[f. Gr. ὤψ, ὀπ- voice + εἶδο-ς form, image + -scope.]
An instrument invented by Prof. A. E. Dolbear (West Virginia), consisting of a tube closed at one end by a tense membrane, having attached to its centre a small mirror, to show the musical vibration caused by speaking or singing at the open end.
1873A. E. Dolbear in Prescott Sp. Telephone (1879) 262 While engaged in making a manometric flame capsule, I invented the opeidoscope. |