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 223
n be installed to drive an elevator, is to arrange it soas to drive a counter shaft continuously, in which case the ele-vator is stopped and started by throwing belts on the tight orloose pulley as in fig. 4,138. This system may be fully classified as a continuous operating non-reversible full… … Fig. 4,142.—Diagram of Otis direct current field control (Leonard device). A full mechanical reversible or single belt installaton is shown infig. 4,143. As will be seen, the principal difference in the mechanismis that the tight and loose pulleys are replaced by a single tight pulleyand a…
Electrical engineering
Internet Archive · Brigham Young University · Public Domain Mark 1.0. Free to use for anything.
