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 448
ight of way, there is nomeeting between switches. The detailed description is given below. There are three separate operating parts, — a signal setting-box, a signalreleasing-box, and the semaphore box. The signal setting-box is shown with details in Fig. 3. The magnets are11 in. x 1\ in.…
Electrical engineering
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