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 466
al Ventilation.-—This may be secured either byinternal circulation or circulation of outside air. In the first7 ELECTRIC RAILWAYS 2,557 mentioned method, the heat is distributed by keeping thewarm air stirred up through the ducts. The method of circulating the external air through the in-terior of… … Fig. 3,519.—Method of forced ventilation with external air. In construction, the fan is castintegral with the pinion end armature head, which draws air in through a screened inlet.In operation, the air passes around field coils, over and through the commutator andarmature coil, carrying the heat…
Electrical engineering
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