Carbon microphone, invented in 1878 by David Edward
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
Picture No
13907109
Media ID
48517263
Size
6000px x 5532px
(2.6MB)
Credit
World History Archive / Mary Evans Picture Library
Source
World History Archive





























