Electric transmission of energy and its transformation, subdivision, and distribution. A practical handbook (1894)
Kapp, Gisbert, 1852-1922 · New York, Van Nostrand · leaf 88
eld. Roughly speaking, we may take it that air offersto the lines of force about 800 times the resistance ofiron, and if we can contrive to fill part of the spacebetween the polar surfaces with iron, a considerable in-crease of electro-motive force, and consequently of cur-rent, will be the result.… … dynamo constructed on this principle is that of Siemens,invented in 1855, and provided with the so-called shuttle-wound armature. The core consists of an iron cylinderprovided with two deep longitudinal grooves placed oppo-site so that the cross-section resembles a double T withrounded heads. The…
Electric power production
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