American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 608
ith-drawn by its spring s, and the supply port hole is again closed, the counter poiseCP, will raise the semaphore to the danger point; the air remaining in the air cham-ber escaping at the exhaust port. As already stated, for a portion of the electrical circuits required in the opera- THE UNION… … ELFCTRO-PNEUMATIC RAILWAY SIGNALS—THEORY—UNION ELECTRIC SYSTEM. next block by the insertion of an insulating medium between the end rails at tliedividing points of the blocks, as at 1,1, in Fig. 373, in w^hich t,t are the rails. Toinsure a thorough connection between the rails of each block a piece…
Telegraph
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