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Bible Dictionaries
Aerophone

Webster's Dictionary

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(1):

(n.) An instrument, proposed by Edison, for greatly intensifying speech. It consists of a phonograph diaphragm so arranged that its action opens and closes valves, producing synchronous air blasts sufficient to operate a larger diaphragm with greater amplitude of vibration.

(2):

(n.) A form of combined speaking and ear trumpet.

Bibliography Information
Webster, Noah. Entry for 'Aerophone'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​a/aerophone.html. 1828.
 
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