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- · New York, T. Audel · leaf 84
rto timber, not breaking around, and may be supported at eachtimber only. 772 HAWKINS ELECTRICITY The best location for feeders is on the walls. In dry buildings thefire and weather proof wire can be used with safety; but covered wiremust be used on buildings subject to any form of dampness. In… … Fig. 860 to 866.—Various porcelain knobs and cleats. In opea work various forms of thesedevices are used. boxing. In such cases, the holes in the boxing through which thewires pass to the switches should be provided with porcelain bushings. 10. The rosettes, receptacles, sockets, snap switches,…
Electrical engineering
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