Title
Robert Hooke's proposal for an aerial telegraph
Caption
Robert Hooke's proposal for an aerial telegraph (semaphore),1684. Thirty symbols cut out of wood were hidden behind a screen, A, supported on a wooden framework. By pulling the rope, D, a symbol could be drawn into view at B, and seen through a telescope by a distant observer. Print published in Paris circa 1870
Date
1870
Credit line
Photo12/Ann Ronan Picture Library
Reference
ARP17A31_123
License type
Rights managed
Available size
60,0Mb (2,4Mb) / 14,0in x 16,7in / 4193 x 5002 (300dpi)