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Bible Encyclopedias
Microphone

The Nuttall Encyclopedia

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An instrument invented in 1878 by Professor Hughes, and consisting of charcoal tempered in mercury, which intensifies and renders audible the faintest possible sound.

Bibliography Information
Wood, James, ed. Entry for 'Microphone'. The Nuttall Encyclopedia. https://www.studylight.org/​encyclopedias/​eng/​nut/​m/microphone.html. Frederick Warne & Co Ltd. London. 1900.
 
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