. A text-book of radiology . RSS S£Nl£S WOUND DYNAMO Fig. SHUNT WOUND DYNAMO Fig. 7. opposite points, and the ends connected one to each of twoslip rings which are also insulated from the shaft andfrom each other, and by means of brushes the alternatingcurrent generated in the armature is collected. In thecase of a very small alternator, one or more permanentmagnets may be used for the field magnet. This is thecase in the magneto machines which are found in motorcars for ignition purposes. The direct current dynamo is a reversible machine,that is to say, it will not only generate electrici
. A text-book of radiology . RSS S£Nl£S WOUND DYNAMO Fig. SHUNT WOUND DYNAMO Fig. 7. opposite points, and the ends connected one to each of twoslip rings which are also insulated from the shaft andfrom each other, and by means of brushes the alternatingcurrent generated in the armature is collected. In thecase of a very small alternator, one or more permanentmagnets may be used for the field magnet. This is thecase in the magneto machines which are found in motorcars for ignition purposes. The direct current dynamo is a reversible machine,that is to say, it will not only generate electricity whendriven from some source of mechanical power, but if DYNAMOS. 21 supplied with electricity from any external source it willgive back the energy in the form of mechanical dynamo and motor are structurally the same—a gooddynamo will give good results as a motor and vice current dynamos are divided into two main classes—series and shunt. In the former the whole currentgenerated in the armature traverses the field magnet coilsas
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