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 496
the lesser number of pole with armature short circuited. Ques. How are the changeable pole and cascade meth-ods combined? ELECTRIC RAILWAYS 2,587 Ans. By first making the sequence of pole change and thenapplying either of the cascade methods, thus giving several speeds. Combined Direct Current and… … Pig. 3,642.—Westinghonse standard resistance grids for railway service. These grids aredesigned with the object of providing ample mechanical strength and liberal current carryingcapacity. Individual grids of sufficient section to resist breakage are used; and this,together with the triangular…
Electrical engineering
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