Megaphone communications, 19th century

Megaphone communications, 19th century

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Credit: SCIENCE PHOTO LIBRARY

Caption: Megaphone communications. 19th-century illustration of a large sets of megaphones being used to communicate with an airship. The amplification of the soldier's voice has enabled communication over a distance of some four kilometres. This illustration is from 'Physique Populaire' (Emile Desbeaux, 1891).

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