Hobart, H. M. (Henry Metcalf), 1868-1946 ed · Philadelphia, J. B. Lippincott · leaf 328
. Vulcanite, a term applied to a black,hard substance produced by vulcanising amixture of indiarubber with from 20 to 30per cent of sulphur. It takes a high polish,and is useful as an insulator in electricalwork. [h. d. s.] w W, the preferable abbreviation for watt(which see). W, the chemical… … Walker Commutator of shrink-ring commutator in which thebrush-bearing surfaces are vertical. The con-struction will be understood from the fig.This commutator is a type of side-bearingcommutator. Walker Fan-Brake Dynamometer.See Dynamometer, Absorption. Wall - entrance Insulator. See In-sulator.…
Electrical engineering
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