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 92
fixture without cutting and disfiguringthe canopy. 780 HAWKINS ELECTRICITY Concealed Knob and Tube Wiring.—This method of wir-ing should be discouraged as far as possible, as it is subject tomechanical injury, is liable to interference from rats, mice, etc.As the vdres run according to this method… … Fig. 877.—Concealed knob and tube wiring. The wires are carried on porcelain knobs attachedto the beams. If run perpendicular to the beams, holes are bored in the latter and porcelaintubes with a shoulder at one end, inserted in the holes through which the wires pass. Theknobs should support the…
Electrical engineering
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