International Library of Technology · Scranton, International Textbook Co. · leaf 216
the air upon glass knobs attached to poles, again the resist-ance between conductors, or from the conductors to theearth, would be comparatively enormous. This resistance isknown as the insulation resistance of the circuit, and, itis obvious, should be as great as possible. ;S521. In almost all… … In telegraph and telephone line construction, bare iron orcopper wires are used, and are supported on glass knobs.From the high specific resistance of glass, it would be rea-sonable to suppose that this would insulate the wires verythoroughly from the earth, which would be the case were itnot for…
Electrical engineering
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