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 224
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 reversible controller… … 4,143.—Reversible full mechanical belt driven elevator control system. In operation current from the line wires passes along the dotted connections H H to the contacts 1,1,1,1.The upper left hand I contact is connected to the lower right hand contact, and the upperright hand, to the lower left…
Electrical engineering
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