Carbon microphone, invented in 1878 by David Edward
Carbon microphone, invented in 1878 by David Edward Hughes (1831-1900), English inventor. From Theodore Eckardt Physics in Pictures, London, 1882
Picture No
13907711
Media ID
48381284
Size
6000px x 9103px
(3.3MB)
Credit
World History Archive / Mary Evans Picture Library
Source
World History Archive





























