Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 583
seen fit to constructspecial small motors for this purpose. Considering now some specific examples of telephone chargingand ringing machines. Fig. 401 shows a five-bar magneto generatorfor ringing purposes in small exchanges, adapted to be driven bybelt from any available source of power. A similar… … I-IG. 402.—MAGNETO GENERATOR BELTED TO DIRECT-CTRRENT MOTOR. fields electro magnetically excited being used. Where low voltage(not over 220) direct current is available, the dynamotor is oftenused for ringing purposes. In this the motor and the generatorwindings occupy the same armature core, which…
Telephone
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