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Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)

D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 797

An illustration from Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts, 1880, leaf 797 — gnal, and the optical signal. The optical signal conveys intelligence by exhibiting differ-ent colors. These arc difficult to distinguish at a distance ; and since it has been proved that color-blindness is alarmingly frequent among railway employees, they are being slowly abandoned. Tlic Bisk…

Mechanical engineering -- Dictionaries

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