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 155
injury to the motor. For this reason a rheostat or variable MOTORS 367 resistance, commonly called a starting box is usually insertedin the armature circuit of a motor to prevent an undue rushof current before the motor attains its speed, and subsequentlythe speed is regulated by the cutting in or… … Fig. 415.—View of railway motor, open. The frame is of cast steel for lightness, and whichserves as magnetic circuit and protecting case. It is circular or octagonal in form exceptin very large motors. Four short magnets project from the case. The armature islarge in order to secure the required…
Electrical engineering
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