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 189
tion as short as possible.Earth plates at a distance cannot be depended upon. Long groundwires in a station cannot be depended upon unless a lead is carried tothe parallel grounding pipes installed as described above. 4. As it is advisable occasionally to examine the underground con-nections to see… … Fig. 2.405.—General Electric magnetic blow out arrester for line use. It consists essentiallyof a small spark gap which is in series with a resistance, and between the poles of a magnet.The operation is similar to that of the arrester shown in figs. 2,402 to 2,404, but themagnetis a permanent…
Electrical engineering
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