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 154
SURFACE OF STREEl … Xv$S\^^ MAIN —- 10 III Fig. 989.—Method of lajnng Edison underground tube system. The tubes are laid in trenchesabout 30 inches deep and 20 inches wide at the bottom, each trench usually containingtwo lines of pipes—a main adjacent to the curb and a. feeder on the outside. The copperrods forming…
Electrical engineering
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