Title
Carbon microphone, invented in 1878
Caption
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
Date
1890
Credit line
Photo12/Ann Ronan Picture Library
Reference
ARP07102_390005770
License type
Rights managed
Available size
33,1Mb (1,4Mb) / 11,8in x 10,9in / 3543 x 3267 (300dpi)