Word Study
phoneidoscope
CIDE DICTIONARY
phoneidoscope, n. [Phono- + Gr. e'i^dos form + -scope.].
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. [1913 Webster]
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