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 144
breaking joint with those of the tiersabove or below. 832 HAWKINS ELECTRICITY The trough conduit consists of ducts about 3 inches squaremade of horizontal boards and vertical partitions, usually ofyellow pine about one inch in thickness. This form of conduitcan be laid in convenient lengths of 10… … Fig. 979.—Wooden pipe type of conduit. It consists of pieces of wood about 4 H inchessquare, and three to six feet long, with a wide hole about three inches in diameter, boredthrough them longitudinally. Oues. How can this be prevented? Ans. The decay of the wood can be prevented to a certainextent…
Electrical engineering
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