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 283
ing of a pillar crane mounted on atruck, and provided with power capable of propelling and rotatingthe crane, and of hoisting and lowering the load. Bridge cranes.—Having a fixed bridge spanning an opening and atrolley moving across the bridge. Tram cranes.—Consisting of a truck, or short bridge… … c Fig 4,210.—Electric derrick crane. The load hangs from the end of the jib A, which is sup-ported by the pin B, and rope C, which leads to the jibbing drum D, by which the jib canbe lowered. The load rope E, is led to the drum F. Drums D and F are driven by motorG. A clutch is provided by which…
Electrical engineering
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