French optical telegraph system. 19th-century copy of an alphabetic table used for signals in the mechanical-optical semaphore telegraph system ('aero
RMID:Image ID:2ACWB32
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Science Photo Library / Alamy Stock PhotoImage ID:
2ACWB32File size:
50.4 MB (2.1 MB Compressed download)Releases:
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3380 x 5215 px | 28.6 x 44.2 cm | 11.3 x 17.4 inches | 300dpiDate taken:
28 January 2014Photographer:
KING'S COLLEGE LONDON/SCIENCE PHOTO LIBRARYMore information:
French optical telegraph system. 19th-century copy of an alphabetic table used for 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).