Thomälen, Adolf, 1865-, Thomälen Adolf. Kurzes Lehrbuch der Electrotechnik. English · London, E. Arnold · leaf 308
are alternately north and south. Such is the case in the old Ferrantitype of machine (Fig. 290). The armature consists of a wave-shaped copperband, which rotates in the narrow gap between the two crowns of poles.The poles shown in the figure lie behind the paper, while a second set ofpoles is…
Electrical engineering
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