Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 556
system is semi-automatic. ELECTRIC RAILWAYS 2,647 Ques. What road conditions require long blocks? Ans. Blocks should be longer on a descending grade than on an up grade because it is more difficult to stop a train on a descending grade. Another feature involved is the curvature of the road or… … Fig. 3,742.—Intersection of two double track lines, with their respective signals. If thseabe automatic track relays properly interconnected, they can be readily arranged togive the protection desired. If they be semi-automatic, electric interlocking will beintroduced to prevent confliction of…
Electrical engineering
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