carbon microphone

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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
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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References in periodicals archive
He moved back toLondonin 1857 where he created a carbon microphone while trying to make improvements to the recently invented telephone.
11 Londoners who changed the world who you probably never heard of; The little known Londoners who made waves around the world
Was it the light bulb, the modern bagless vacuum cleaner or the carbon microphone? You can find out whether the circular saw was invented by a woman or a man and read about explorer robots.
Gifford, Clive: Robot's Revenge: A Robotics and Inventions Adventure (Rubik's Quest)
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.
T GREAT OUR INVENTIONS INVENTIONS; New book challenges some accepted facts
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