Searchlight on Eiffel Tower, 19th century

Searchlight on Eiffel Tower, 19th century

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Credit: SCIENCE PHOTO LIBRARY

Caption: Searchlight on Eiffel Tower. 19th-century illustration of clouds being illuminated by one of the large electric searchlights installed on the Eiffel Tower after its construction for the Universal Exposition (World Fair) of 1889 in Paris, France. These searchlights were based on the Mangin projector of the early 1880s, a light-signalling device used in optical telegraphy. Originally designed to be used as either a reflector of sunlight or an oil-fuelled lamp, here it has been adapted to use electrical power with the beam visible from 300 kilometres away. This illustration is from 'Physique Populaire' (Emile Desbeaux, 1891).

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