Practical wireless telegraphy; a complete text book for students of radio communication (1917)
Bucher, Elmer Eustice, 1885- · New York, Wireless Press, Inc · leaf 40
oleswould be reversed accordingly and be-cause the strain of the two magnetic fieldswould have the same general directionthe motor would revolve in the same di-rection as before. Careful considerationof this fact reveals that in order tochange the direction of rotation of thearmature, the flow of… … 30 PRACTICAL WIRELESS TELEGRAPHY. ings. The type known as the diflferential wound motor appears in Fig. 29 and will bedescribed further on. 39. The Effect of Counter Electromotive Force.—When a motor armatureis set into motion by an external current, the loops of wire composing its coils cut…
Telegraph, Wireless
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