Electrical engineer's pocket-book: a hand-book of useful data for electricians and electrical engineers (1901)
Foster, Horatio A. (Horatio Alvah), 1858-1913 · New York, D. Van Nostrand co.; London, E.& F.N. Spon, ltd. · leaf 447
the conductors of cars passing it at the switches, and the signal systems forcars operating in opposite direction are entirely independent. In each … signal box there is also a pilot lamp which is extinguished when the sectionof track is opened, and illuminated when the section is closed ; this gives RAILWAY TURNOUTS. 435 the conductor knowledge that his signals have operated properly at thedistant switch. As the first signal set gives the right…
Electrical engineering
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