. Practical wireless telegraphy; a complete text book for students of radio communication . ing contact arm moves. An-other type used by the MarconiCompany has a number of turns ofbare resistance wire wound on aslate base. A sliding contact mov-ing over the turns permits veryclose regulation of the flow of cur-rent in the field winding. A rheo-stat of this type is essential formotor generators used withquenched spark transmitters whichrequire extremely close regulationof the generator voltage. 54. Dynamotor and RotaryConverter.—The dynamotor andthe rotary converter are employedoccasionally to
. Practical wireless telegraphy; a complete text book for students of radio communication . ing contact arm moves. An-other type used by the MarconiCompany has a number of turns ofbare resistance wire wound on aslate base. A sliding contact mov-ing over the turns permits veryclose regulation of the flow of cur-rent in the field winding. A rheo-stat of this type is essential formotor generators used withquenched spark transmitters whichrequire extremely close regulationof the generator voltage. 54. Dynamotor and RotaryConverter.—The dynamotor andthe rotary converter are employedoccasionally to generate alternat-ing current from a D. C. source ofsupply. The distinguishing feature of these machines is the use of a single arma-ture for both A. C. and D. C, hence, but two bearings are required and the con-struction of the machine as a whole is simplified. These machines also requireless space to erect, but they possess the marked disadvantage of not allowingfull control over the voltage. Also they are not as efficient as the motorgenerator when connected to a radio Fig. 68—Cutler Hammer Type Field Rheostat.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
