The signal-posts carrying the movable arms, or semaphores, by means of which the signalman communicates with the engine-driver, are well known to us. [Please select]
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It denoted at first a system of semaphores, or tall poles with movable arms, and other signaling apparatus, set within sight of one another. [Please select]
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In performing this last operation Sam locked all the semaphores, and so rendered his part of the line absolutely impregnable. [Please select]
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