Optical communications, 19th century

Optical communications, 19th century

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Caption: Optical communications. 19th-century illustration of the French military communicating using an optical system of lights and mirrors. The French military developed a number of such systems, including an advanced optical telegraphy system, before the widespread use of telegraphy and telephones. This illustration is from 'Physique Populaire' (Emile Desbeaux, 1891).

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