carbon microphone


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Related to carbon microphone: movie camera, mimeograph

carbon microphone

n
(Electrical Engineering) a microphone in which a diaphragm, vibrated by sound waves, applies a varying pressure to a container packed with carbon granules, altering the resistance of the carbon. A current flowing through the carbon is thus modulated at the frequency of the sound waves
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References in periodicals archive ?
The previously mentioned David Edward Hughes invented the printing telegraph system (teleprinter) in 1856-59, and the carbon microphone vital to telephony and broadcasting in 1877.
The carbon microphone was eventually replaced by a pressure sensor.