Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 245
ive current while the block governed by thesignal is being cleared. When the signal subsequentlyindicates clear the motor is open-circuited but the flowof current through the holding magnet remains uninter-rupted. The holding magnet is fixed to the slot arm C which rocks around pivot D. This slot… … Fig. 3. passing of a train out of the block causes the operation ofthe semaphore motor, the rotation of which produces anupward movement of the chain through the gear-wheelsH and /. Simultaneously, the armature of the holdingmagnet is attracted, thereby holding the system of links RAILWAY SIGNAL…
Telegraph
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
