Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity (1905)
American School (Chicago, Ill.) · Chicago : American School of Correspondence · leaf 204
p put over thewire and firmly bolted together. Where ground plates are used, a Xo. 10 copper plate, about3 by 6 feet in size, with about two feet of crushed coke or char-coal, about pea size, both under and over it, woulrl make a groundof sufficient capacity for a moderate-sized station, and would… … TO GROUND DIRECT CURRENTGROUND DETECTOR
Electrical engineering
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