Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 264
e has been properly com-pleted. The movement of a lever locks all levers conflictingwith its new position and operates the device which it RAILWAY SIGNAL SYSTEMS 249 controls. This interlocking of levers is performed at the locking bed located at the front of the machine, byhorizontal locking bars… … Fig. 19. dogs carried by these bars move into the notches on cer-tain tappet bars, thus locking their corresponding levers. A simple illustration of the function of an interlockingmachine will be considered in connection with Fig. 20which represents the position of signals and derails at…
Telegraph
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