Electric transmission of energy and its transformation, subdivision, and distribution. A practical handbook (1894)
Kapp, Gisbert, 1852-1922 · New York, Van Nostrand · leaf 447
are of the type shown in Fig. 158. They are six-polecontinuous-current dynamos, with drum-wound arma-tures. Great precautions are taken as regards insula-tion, not only of the winding from the core, but of the Fig. 157. … machine itself. Thus the armature core is insulated fromthe shaft, and to prevent sparking from the armatureconductors to the pole-pieces, the whole armature, afterwinding, is wrapped round with layers of paper andshellaced cloth. The field-magnets are insulated fromthe bed-plate by thick layers of…
Electric power production
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