An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 561
together by copper bonds to insure goodconductance. In some cases there are also return feeders fromthe rails to the power house (or substation). (2) In some cities, such as Washington and New York,the overhead line is replaced by an underground line. Thecurrent is picked up by the car from… … Concrete Fig. 351. Underground Conductor Underground line carried in slot-conduit. system is expensive to install and cannot be operated wheresnow is abundant in winter. (3) The third-rail system is the usual method of suppfy-ing current to electric railways operating in subways or onelevated…
Electricity · Magnetism
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