Electric transmission of energy and its transformation, subdivision, and distribution. A practical handbook (1894)
Kapp, Gisbert, 1852-1922 · New York, Van Nostrand · leaf 130
evident thatthe proper function of the field magnets in a dynamo ormotor is to produce lines of force which pass across thearmature core. All other lines which miss the armatureare useless and may even be detrimental to the workingof the machine. The greater the number of useful linesthe greater… … NDE SHORT CYLINDER. Fig. 42.Maxim.
Electric power production
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