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Caselli pantelegraph, 19th century

Caselli pantelegraph, 19th century

C024/6457

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Credit

SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY

Caption

Caselli pantelegraph. Historical illustration of the pantelegraph of 1865 developed by Italian physicist Giovanni Caselli (1815–1891). This was an early form of facsimile machine. It transmitted a two-dimensional image as a series of electrical pulses. An electrically-conductive swinging pendulum acted as a scanning stylus by moving back-and-forth and line-by-line across a copper plate containing a raised image. The receiver, equipped with a similar pendulum, generated an exact replica of the original image. Artwork from 'Electricite' (1911) by Max de Nansouty, part of the 'Les merveilles de la science' series of 1867-1891 by Louis Figuier.

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