Carbon microphone, 1882
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Carbon microphone, 1882
Carbon microphone, 1882. Device invented in 1878 by David Edward Hughes (1831-1900), English inventor. From Physics in Pictures by Theodore Eckardt. (London, 1882)
Media ID 14864097
© Oxford Science Archive / Heritage-Images
Carbon Chromolithograph Communication Eckardt Hughes Invention Microphone Oxford Science Archive Physics Telecommunication Telecommunications Theodore
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