The standard electrical dictionary : a popular encyclopaedia of words and terms used in the practice of electrical engineering (1898)
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · London : Crosby Lockwood and Son · leaf 609
of heavy oil in thelower cup. Insulator, Floor. A tube of insu-lating material to give protection andadditional insulation to a conductor pass-ing through a floor. Insulator, Section. An insulatorfor maintaining the electrical separationof adjacent sections (see Trolley Section)of a trolley wire… … Fig. 366.Floor Insulator.
Electricity
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