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Meaning of AEROPHONE

 
Webster's 1913 Dictionary
 
 Definition: 
\A"["e]r*o*phone`\, n. [A["e]ro- + Gr. ? voice.]
(a) A form of combined speaking and ear trumpet.
(b) 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.

 

 

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