Dynamo-electricity: its generation, application, transmission, storage and measurement (1884)
Prescott, George B. (George Bartlett), 1830-1894 · New York, D. Appleton · leaf 716
tion of electro magnets upon permanent magnetswas employed. In this machine two small horizontal electromagnets, placed across, and movable around a vertical axis,revolve in the interior of a circle also horizontal, formed by twopermanent magnets, bent into semicircles, and whose poles ofcontrary… … Fig. 46 L Froments machine, which is represented in fig. 461, is found-ed upon the attraction that is exercised by an electro magnetupon an armature of soft iron. It is composed of four fixedelectro magnets, supported by a cast iron frame, in which thesame current circulates by turns. Eight soft…
Electrical engineering
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