Pho″no‐scope (?), n. [Phono- + -scope.] (Physics) (a) An instrument for observing or exhibiting the motions or properties of sounding bodies; especially, an apparatus invented by König for testing the quality of musical strings. (b) An instrument for producing luminous figures by the vibrations of sounding bodies.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.