A dictionary of electrical words, terms and phrases (1898)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W. J. Johnston company · leaf 302
311 and 312. Of whatever material they aremade, it is necessary that thesurface on which the wire rests,or around which it is wrapped,should be smooth, so as to avoidabrasion, either of its insulating covering or of the wire it-self. Two things are to be considered in the selection of aninsulator,… … Fig. 312. HardRubber Insulator. that in case of heavy wires no breaks may resultfrom the fracture of the insulator. Some forms of insulators are shown in Figs.310, 311 and 312. They are screwed to the pinsby the threads shown. The insulating materialsof which they are formed are of glass,…
Electricity · Electrical engineering
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