Carbon microphone, invented in 1878 by David Edward Hughes, 1890
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Carbon microphone, invented in 1878 by David Edward Hughes, 1890
Carbon microphone, invented in 1878 by David Edward Hughes, 1890. The apparatus was said to be so sensitive that a fly walking on the sounding-board could be heard by an observer on a telephone several miles away. From Electricity in the Service of Man translated by R Wormell from the German of Alfred von Urbanitzky. (London, 1890)
Media ID 14846427
© Ann Ronan Picture Library / Heritage-Images
Carbon Electric Electricity Hughes Innovation Invention Microphone Sound
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