phoneidoscope

Phoneidoscope

Pho*nei"do*scope\, n. [Phono- + Gr. ? form + -scope.] (Physics) An instrument for studying the motions of sounding bodies by optical means. It consists of a tube across the end of which is stretched a film of soap solution thin enough to give colored bands, the form and position of which are affected by sonorous vibrations.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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