. The principles underlying radio communication . tis good the set fails to operate satisfactorily. The most commontroubles, electrically, are due to a dirty commutator, poor brushcontacts, or to turning the brushes in replacing them, so thatthe curve of the brush does not match the curve of the com-mutator. GasoUne-Engine Driven.—Hand power is not practical, exceptfor very small generators, since a man can develop only about 18 See Fig. 103, page 164, and foot note, page 165. A little generator of for the field coils of the alternator. SeeSec. 71. The commutator is described in. Sec. 86.
. The principles underlying radio communication . tis good the set fails to operate satisfactorily. The most commontroubles, electrically, are due to a dirty commutator, poor brushcontacts, or to turning the brushes in replacing them, so thatthe curve of the brush does not match the curve of the com-mutator. GasoUne-Engine Driven.—Hand power is not practical, exceptfor very small generators, since a man can develop only about 18 See Fig. 103, page 164, and foot note, page 165. A little generator of for the field coils of the alternator. SeeSec. 71. The commutator is described in. Sec. 86. 194 DYNAMO-ELECTRIC MACHINERY. one-tenth of a horsepower if he has to keep it up for more thana short time. One of the most convenient sources of largerpower is the gasoline engine. It is particularly suitable forisolated stations, or for the more powerful portable sets, likethe field radio tractor sets. Detailed information about anyparticular set is supposed to be furnished with the set, but cer-tain features are likely to be common to FiQ. 119 Connec-Tions of ^cKSeT^enerAtorD - exciter ArrrkstureC5-A-C genenaTor LP - E-Xciter -fieldAF- iLlterndtbr -fieldPi Pz~^^S conec-tionsK - ^endin^ Ke^T - Coil o| transformer Ac. rheo
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Keywords: ., bookcentury1900, bookdecade1920, bookpublisherwashi, bookyear1922
