Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 709
THE BOND OF WIRES CONNECTING THE ENDS OF THE HAILS. The iron clamp is not a good conductor on account of the rust between it and the rails. leaking through a thin film of water in wetweather, as it would, because water is a goodconductor of electricity. Sometimes the currentis so powerful that it… … THE GLISTENING PORCELAIN INSULATORS. The roofed caps are on the crossbars. On both sides of each of these are two insulators on the safety wire. there is, in the New Haven overhead system, asafety wire, on which are four insulators. These are the conspicuous, glistening balls that have nodoubt…
Children's literature
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