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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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