A dictionary of electrical words, terms and phrases (1896)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W.J. Johnston company · leaf 446
ently elevatedabove the road-bed to afford the operator an un-obstructed view of the tracks. The operator, having ascertained the actualcondition of the track, either by observation or bytelegraphic communication with the stations oneither side of him, gives notice of this condition toall trains… … Fig. 463. Semaphore Signal—Absolute System. lute system, and that shown in Fig. 464 m the per-missive system. These signals consist essentiallyof an upright support provided with a movablearm A B, called the semaphore arm, capable ofbeing set in any of two or three positions. Thesemaphore signal is…
Electricity · Electrical engineering
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