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 269
minating the necessity of thrust bearings. ELECTRIC ELEVATORS 2.923 Double Reduction Worm and Internal Gear Drive.— For very slow heavy duty freight elevators, operated by highspeed motors, the excessive speed reduction necessary is bestobtained by double reduction drive employing a combination… … Fig. 4,194.—Warner internal spur gear freight elevator machine, fitted for mechanical control.The gear spider S and drum D are made in one casting with a heavy cast iron neck betweenthem. On top, the motor M, is the controller box C, containing the switches and rheostat.N, is the brake, R, shipper…
Electrical engineering
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