a series of lantern slides projected on canvas, and the why the use of the stereopticon should not prove high- 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. 8.—ELECTRIC DISK BLOCK SIGNAL. Fig. 2.—TRAIN SIGNALS ON ENGINE. Fig. 1— SEMAPHOEE SIGNAL. Train may proceed. Schedule train backing up at night. Main line closed, local open. 11899 SCIENTIFIC AMERICAN, INC.
Patents · Apparatus · Bicycle · Basin · Scientific American · Carriage · Sodium carbonate · Liquid air · Vehicle company · Sodium hydrate · Horse power · Great Britain · Sodium sulphite · Electric vehicle · Large number
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