American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 617
, the tower is insulated,and made a portion of a circuit which latter controls a relayand magnet in such a manner that when a train enters theinsulated section it automatically sets as signal at danger.Hence, when a wishes to place the signal at safety he mustfirst ask the tower in advance to… … FHE STEWAET-HALL TRAIN OEDER SIGNAL. In connection with the Hall railway signal system, arecent device, termed a train order signal, has been in-troduced. One of its objects is to hold trains at any stationwhere an order may be awaiting them. The train or-der semaphore is shown in Fig. 380. The…
Telegraph
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