. American telephone practice . FIG. 336.—GOVERNOR FOR RINGING MACHINE, KELLOGGPARTY-LINE SYSTEM. motor, this motor serving to drive all four generators. The motoris the center one of the machines shown. The generators are re-spectively of the two-pole, four-pole, six-pole and eight-pole type,and being driven at the rate of 1000 revolutions a minute, therefore PARTY LINE SYSTEMS. 457 produce currents having frequencies of 2000, 4000, 6000 and 8000alternations per minute. In order to properly govern the speed of the motor so that itwill not fluctuate with changes in the primary voltage, a gov-e
. American telephone practice . FIG. 336.—GOVERNOR FOR RINGING MACHINE, KELLOGGPARTY-LINE SYSTEM. motor, this motor serving to drive all four generators. The motoris the center one of the machines shown. The generators are re-spectively of the two-pole, four-pole, six-pole and eight-pole type,and being driven at the rate of 1000 revolutions a minute, therefore PARTY LINE SYSTEMS. 457 produce currents having frequencies of 2000, 4000, 6000 and 8000alternations per minute. In order to properly govern the speed of the motor so that itwill not fluctuate with changes in the primary voltage, a gov-ernor, shown in diagram and perspective in Fig. 336, ismounted upon the end of the motor shaft. This consists of aball, b, mounted by means of a spring on the armature shaft. Thisspring is adapted to make contact with the point, o, when the ballis thrown outward by centrifugal force. The method of govern-ing is as follows: With the desired rate of revolution, 1000 perminute, the motor was so constructed as to run at 900 revolu
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Keywords: ., boo, bookcentury1900, bookdecade1900, bookidamericantelepho00mill
