Practical wireless telegraphy; a complete text book for students of radio communication (1917)
Bucher, Elmer Eustice, 1885- · New York, Wireless Press, Inc · leaf 66
EMO PLATES MOTOR -FfELD GtMERATOR FJELD … Fig. 67a—Details of Crocker Wheeler 2 K. W. 500 Cycle Motor Generator. generator has 30 field poles and the motor 2 field poles. The armature revolves at2,000 R. P. M., hence there are 33 1-3 revolutions per second which multipliedby 30 (the number of field poles) gives 1,000 alternations of…
Telegraph, Wireless
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