Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833- · New York, T. Audel · leaf 157
5 of the transformer from its original form, consisting of aniron core enclosed by coils of wire, to its present degree of refine-ment and economy of material, has been comparatively rapid. In transformer construction it is obviously very importantthat the insulation be of the best quality to… … Pig. 1,973.—Assembled coils of General Electric water cooled 500 leva., 66,000 volt transformer. It consists usually of mica tubes, sometimes applied as sheets held inplace by the windings, when no ventilating ducts are provided, or mouldedto correct form and held between sheets of tough insulating…
Electrical engineering
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