Title
Carbon microphone, invented in 1878
Caption
Carbon microphone, invented in 1878 by David Edward Hughes (1831-1900), English inventor. From Theodore Eckardt "Physics in Pictures", London, 1882
Date
1882
Credit line
Photo12/Ann Ronan Picture Library
Reference
ARP07103_460000371
License type
Rights managed
Available size
23,7Mb (844,6Kb) / 7,8in x 11,8in / 2335 x 3543 (300dpi)