Sujet
Robert Hooke's proposal for an aerial telegraph
Légende
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
Crédit
Photo12/Ann Ronan Picture Library
Notre référence
ARP17A31_123
Licence
Droits gérés
Format disponible
60,0Mo (2,4Mo) / 35,5cm x 42,4cm / 4193 x 5002 (300dpi)