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 446
when a car passes out ofthe south siding going north. Another method, a manual one, is in use by the Lehigh Valley TractionCo. on all the street railways in and about Allentown and Bethlehem, Penn.One advantage claimed for this system over an automatic method is, thatthe conductor is responsible… … Fig. 3. ahead, a magnet operating a red semaphore and incandescent lamps be-hind a red glass disk. This makes the signal visible both night and day.This semaphore stays set until he reaches the switch ahead ; then the con-ductor opens the circuit which sets the track behind him to safety. If…
Electrical engineering
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