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50.3 MB (50.0 MB compressed)
5199 x 3380 pixels
43.9 x 28.7 cm ⏐ 17.3 x 11.3 in (300dpi)
SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Railway signals. 19th-century illustration of five types of signals used on railways to direct locomotives and trains. These semaphore signals use the direction of the cross-arms and colours to communicate speed limits. Artwork from 'Chemins de Fer, Automobiles' (1911) by French civil engineer Max de Nansouty (1854-1913), part of the 'Les merveilles de la science' series of 1867-1891 by Louis Figuier.
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