Article deals exclusively with relays used in signal work operated by direct current; theory of electromagnet as applied to operation of d-c relays; neutral, polarized, slow drip-away, slow pick-up, flasher, interlocking, two-rate change control, power transfer, plug-in, and centralized traffic control type neutral relays discussed; relay coil combinations.
American railway signaling principles and practices: chapter VI; direct current relays
American Railway Signaling Principles Practices
American Railway Signaling Principles and Practices ; Chapter VI
1942
33 pages
Book
English
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