The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 336
upply. Until recently, such motors could only be driven at someone speed, which depended upon the frequency of the alterna-tions, and independent means of starting and accelerating upto that speed had to be provided, such as a small direct-currentmotor, coupled to the alternating one, and driven by… … Fig. 311working currents and currents which circulate in the armature 3o8 PRACTICAL TELEPHONE HANDBOOK or rotor coils, wliich latter currents are wholly due tothe inductive action of the magnetic field of the field magnets,or stator. The rotor coils are complete in themselves,
Telephone
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