A dictionary of electrical words, terms and phrases (1896)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W.J. Johnston company · leaf 445
Fig. 460. Safety System for Bridge. Fig. 461 shows the application of the safetysystem at grade crossing. … Fig. 461. Safety System for Grade Crossing. The author is indebted to Air. E. P. Thompsonfor cuts and general description. Railroads, Block System for A sys-tem for securing safety from collisions of mov-ing railroad trains by dividing the road into anumber of blocks or sections of a givenlength,…
Electricity · Electrical engineering
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