French optical telegraph system,1833

Numéro d’image : 11672856
French optical telegraph system,1833
French optical telegraph system. 19th-century table of sound (left) and colour (right) signals in the mechanical-optical semaphore telegraph system ('aerographe') developed by French inventor Pessault Delatour. Mechanical-optical telegraphy had been invented by French engineer Claude Chappe in the 1790s. Later systems refined the concept but were largely abandoned following the development of electric telegraphy by Morse and others in the 1840s. This table for encoding signals is from Delatour's 'Aerographe: systeme universel de communication d'idees au moyen de signaux sonores et visuels,mis a la portee de tout le monde' (1833)
Licence : Droits gérés
Crédit: Science Photo Library / King's College London
Taille de l’image : 3373 px × 5225 px
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