Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 267
ed a drop of 3.5 millivolts foreach 30-ft. track length, this being due to resistance of track andbonds, and to leakage across ballast and ties. What percentage ofthe battery current traverses the relay? 252 TELEGRAPH ENGINEERING 4. Draw up the locking sheet for an interlocking machine to… … 12 34 signals i and 3 apply to route AC, and signals 2 and 4 apply to routeAB. Switch 5 is shown normally open, and the derails 6 and 9 arenormally set to derail. It should be noted that lever 5 of the machineis imder the immediate control of either lever 6 or 9, for lever 3 (or 4)cannot be…
Telegraph
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