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 151
factory service. It is not affected by moist earth andis impervious to the action of acids, alkalies, and gases. As it is notsubject to expansion and contraction, leakage is practically eliminated,and since it is a very good insulator, troubles due to stray currents arereduced to a minimum. It is… … Fig. 980.—Screw joint type of fibre conduit. This method of connection will form a tight lineand is suitable for running under the lawns of private houses and parks, under the streetsof towns and villages, and in other places where the cost of building electric subwaysis prohibitive. Edison Tube…
Electrical engineering
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