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 139
rior surface so as topermit of the easy drawing in of the cables; and third, a designwhich will permit of its economical installation in crowded streets.There are numerous kinds of conduit of which may be;mentioned: 1. Vitrified clay pipe conduits; 2. Vitrified clay or earthenware trough conduits;… … Fig. 975.—A few forms of vitrified clay pipe conduits; view showing single and multiplextypes. The dimensions of each duct are about 3J x 3^ The lengths vary from two tothree feet. Vitrified Clay Pipe Conduit.-—Various forms of vitrifiedclay conduit appear to possess the qualifications, desirable…
Electrical engineering
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