Modern practice of the electric telegraph. A handbook for electricians and operators (1872)
Pope, Frank L. (Franklin Leonard), 1840-1895 · New York : D. Van Nostrand · leaf 75
parative value of insulators is to fixthem upon frames or standards, in sets of ten or more,and place them where they will be fully exposed tothe weather. The tests should be made when theweather is very wet, by means of a wire attached to.all of-them in the usual manner, and leading to thetesting… … FIG. 39. INSULATION. 63 99. ESCAPE.—When the insulation is defective, or thewire comes in contact with the branches of trees, a wetwall, or other partial conductor, a portion of the cur-rent passes to the ground, forming what is technicallyknown as an escape. 100. WEATHER CROSS.—The escape of the…
Telegraph
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