Pho*nei"do*scope(?), n. [Phono- + Gr. e'i^dos 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.
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Thu 21st February 2019