| 单词 | piston whistle |
| 释义 | > as lemmaspiston whistle piston whistle n. a whistle in which the pitch of the sound is varied by means of a piston sliding in the tube, shortening or lengthening the vibrating column of air. ΚΠ 1890 Cent. Dict. Piston-whistle. 1897 Mind 6 581 The range of audition..is covered by eleven tuning forks and three piston whistles. 1996 Christian Sci. Monitor (Nexis) 30 Oct. (Features section) 12 The extraordinary mechanism, with its bellows and piston whistle. < as lemmas |
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