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
Fig. 310. GlassInsulator. Fig. 311. Porcelain Insulator. ware, porcelain or hard rubber, and assume avariety of forms, some of which are shown in Figs.310, 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…
Electricity · Electrical engineering
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