Tunzelmann, George William von, 1856- · New York, Scribner & Welford · leaf 88
ELECTRIC MACHINES. 75 disc-armatures, in which the coils are flattened againstthe disc, and pole-armatures, which have the coils woundupon separate poles projecting radially from the periphery … Fig. 12.of the disc, as shown in Fig. 12, which exhibits a six-polearmature with commutator and collecting brushes. Methods of Exciting theField Magnets.—There arefive simple ways of producing the Magnetic Fieldin which the armature ofthe dynamo rotates. Ofthese methods the onefirst employed…
Electric industries · Electricity
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