International Library of Technology · Scranton, International Textbook Co. · leaf 159
6 feet square is dug 5 or 6 feetdeep in a location as near the arresters as possible, preferablydirectly under them. The bottom of this hole is then cov-ered with charcoal or coke (crushed to about pea size) to adepth of about 2 feet. On top of this is laid a tinned,copper sheet, about 5 ft. X 5… … .i-ji-i Fig. 46. 44 ELECTRIC TRANSMISSION. § 15 water being used to settle it. This will give a good ground,if made in good, rich soil. It will not give a good groundin rock, sand, or gravel. Sometimes grounds are made byputting the ground plate in a running stream. This, how-ever, does not give as…
Electrical engineering
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