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 568
re commodi-ous street cars (Fig. 358), but for more rapid transit. It wassoon found there was a limit to the speed at which it was safeto run cars through our crowded city streets and also a limitto the frequency at which cars can be operated on a given linewithout getting blocked. The first effort… … r:: . Wfl mfjrrprrjJLJr- Fig. 359. — City streets showing elevated structure and entrance to subway. Then the street cars were put underground in subways (Fig.359). Such a system is expensive to construct, but doesprovide astonishingly quick transportation in congested dis-tricts. 348. Interurban…
Electricity · Magnetism
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