Optical communications. 19th-century illustration of the French military communicating using an optical system of lights and mirrors. The French milit

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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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Size: 4178px × 4182px
Photo credit: © Science Photo Library / Alamy / Afripics
License: Licensed
Model Released: No

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