Bible Dictionaries
Phoneidoscope
Webster's Dictionary
(n.) 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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Bibliography Information
Webster, Noah. Entry for 'Phoneidoscope'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/p/phoneidoscope.html. 1828.