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 206
although frequently, before leadinginto the shaft, they are deflected by the idler in order to leadthem plumb over the counterweight. This accounts for thenecessity of having the same number of groove on each drum. It should be noted that the grooves are straight for tractionelevators and spiral… … Pig. 4,115.—Diagram of Otis, over-mounted 2 to 1 traction elevator.This machine is similar in appear-ance to the standard drum ma-chine, except that a multi-grooved driving pulley is mountedin place of the drum, and a non-vibrating idler leading pulleytakes the place of the vibratingpulley…
Electrical engineering
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