Electric transmission of energy and its transformation, subdivision, and distribution. A practical handbook (1894)
Kapp, Gisbert, 1852-1922 · New York, Van Nostrand · leaf 78
prings on the axis and on the circumference ;the latter being placed on the radius of greatest induc-tion. Lately Professor George Forbes has constructeddynamos on the same principle, the only difference beingthat, instead of using a permanent steel magnet, he usesan electro-magnet which becomes… … for our purpose it will be sufficient to describe one of hisarrangements. The armature of this dynamo, which isillustrated in Fig. 12 in longitudinal section, consists of awrought iron cylinder without any wire on it. The fieldmagnet is a closed iron casing surrounding the armatureon all sides, and…
Electric power production
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