Visual telegraph system. Coloured artwork of the demonstration, in 1791, of the Synchronised System by the French inventors, the brothers Chappe. This was an early telegraph, a system to send messages quickly over long distances. On 2 March 1791, the brothers transmitted a message from Brulon (about 16 kilometres away, centre left) to an identical set-up at Parce (foreground). A system of pendulum weights rotated a pointer on a clock face at each location. Flipping a large black and white card synchronised the pointers and indicated when the pointer moved over the symbol to be transmitted. A group of officials watched the demonstration. From La Telegraphie Historique (Alexis Belloc, 1888).
px | px | dpi | = | cm | x | cm | = | MB |
Details
Creative#:
TOP10241977
Source:
達志影像
Authorization Type:
RM
Release Information:
須由TPG 完整授權
Model Release:
N/A
Property Release:
N/A
Right to Privacy:
No
Same folder images: