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 121
ground, it is necessary that OUTSIDE WIRING 809 the holes be dug to as nearly the required depth as possible.Holes for poles are dug very little wider than their diameter atthe butt, and the depth is usually computed according to thenature of the soil and the weight of the proposed line.…
Electrical engineering
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