Carbon microphone, invented in 1878 by David Edward Hughes (1831-1900), English inventor. From R. Wormell "Electricity in the Service of Man"London, 1890. Engraving

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Size: 3543px × 3267px
Photo credit: © Photo12/Ann Ronan Picture Library / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., /, 1878, 1890., 19th, carbon, century, communications, david, edward, electricity, english, engraving, hughes, invented, invention, inventor., manlondon, microphone, physics, service, sound, telecommunications, telephone, wormell