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Scientific American, Vol. 81, No. 2 (1899) (1899)
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why the use of the stereopticon should not prove high- a series of lantern slides projected on canvas, and the just what kind of a train it is—whether it is ly efficient in the instruction and examination of rail- backing up or going forward, whether it is way employes. While the plan of using… … Fig. 2.—TRAIN SIGNALS ON ENGINE. Schedule train backing up at night. © 1899 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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