File:An elementary book on electricity and magnetism and their applications (1919) (14597261560).jpg

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Identifier: elementarybookon00jack (find matches)
Title: An elementary book on electricity and magnetism and their applications
Year: 1919 (1910s)
Authors: Jackson, Dugald C. (Dugald Caleb), 1865-1951 Jackson, John Price, b. 1868 Black, Newton Henry, b. 1874
Subjects: Electricity Magnetism
Publisher: New York, The Macmillian Co
Contributing Library: Internet Archive
Digitizing Sponsor: Internet Archive

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About This Book: Catalog Entry
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t-r Fig. 361. — Single-phase transmission and railway system. 349. Electric locomotive. In 1896 the Baltimore and OhioRailroad first used electric locomotives (Fig. 362) to haultheir trains through the great tunnel under the city of Balti-more. Ten years later the New York Central Railroad electri-fied their New York terminal, and soon all the railroads run-ning into or under New York City were electrified. Here thelocal conditions of tunnels and congested traffic prohibited
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Fig. 362. — Electric locomotive for hauling heavy trains. the nuisance of smoke, exhaust gases, and the noise of steamlocomotives. Moreover, the electric locomotives greatly facili-tated the rapid handling of the trains at the terminal stations.There are three systems of distributing power for theseelectric locomotives, as follows: (a) Single-phase alternatingcurrent where the trolley voltages (third rails are not used) 510 ELECTRICITY AND MAGNETISM are from 3000 to 11,000 volts and the frequency is 15 or 25cycles. The New Haven Railroad is the largest installationof this type, (b) Three-phase alternating current, which isused at about 3300 volts with two overhead trolley wires.The Cascade Tunnel of the Great Northern Railway has theonly three-phase locomotives in operation in this country,(c) Direct-current system, which is the same as that used sogenerally for city service. In recent years it has been possibleto use as high as 3000 volts on these large direct-current loco-motives,

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