SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Searchlight on Eiffel Tower. 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).
Model release not required. Property release not required.