Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 799
elephone and Tele-graph Company use 24 inches. The insulators used in this country are universally made of glass.Blown glass has been found to be much superior in insulating quali- ;ties to molded glass, but the latter is so very much cheaper that itis always furnished. Fig. 544 shows a form of… … FIG. 544,-STANDARD PONY INSULATOR. or petticoats, the idea of this being that the path for leakage fromthe line to the pin is thereby rendered considerably longer, the leak-age current having to pass up and down the surfaces of both petti-coats in series. For making transpositions a double glass…
Telephone
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