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 199
harged by unscrupulous dealersfor rods and their erection. A lightning rod with defective insulation or broken ground connectionis a danger rather than a protection. LIGHTNING PROTECTION 887 Air Gap Arresters.—Many of the lightning arresters usedfor the protection of electrical apparatus depend… … r IG. 1.040.—Union lightning arrester and ground wire switch for telegraph lines. Two line wiresare attached to the two plates provided with points. The ground wire being connectedto the third or central plate. The pin serves as a ground wire switch and cut out. Thisis a good fomn for short lines.…
Electrical engineering
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