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 217
ossible to employ with itthe dynamic brake used with the direct current motor. Accordingly, the use of alternating current motors is limited to slowspeed elevators which may be slowed down and stopped by the mechani-cal brake alone. Until such time as a variable speed alternating current motor is… … Fig. 4,134.—Cutler-Hammer direct current reversible single speed semi-mechanical con- troller for short lift sidewalk elevators. The equipment consists of a drum case containingthe line and reverse switch and resistance switch, with a space at the back containing thearmature starting resistance.…
Electrical engineering
Internet Archive · Brigham Young University · Public Domain Mark 1.0. Free to use for anything.
