. The principles of physics. Since an alternating current dynamo does not produce a con-stant magnetic field, alternating dynamos, in general, areseparately excited. Such are the West-inghouse and the Thomson-Houston incan-descent-lighting dynamos* Fig. 454 is a series di/navio, where thecoils of the field magnet are joined inseries with the armature so that the en-tire current passes through these coils. Fig. 457 illustrates a shunt machine,where the field-coil serves as a shunt tothe external circuit. L is the main wireand I is the shunt wire. In the shunt machineonly a ^art of the current g
. The principles of physics. Since an alternating current dynamo does not produce a con-stant magnetic field, alternating dynamos, in general, areseparately excited. Such are the West-inghouse and the Thomson-Houston incan-descent-lighting dynamos* Fig. 454 is a series di/navio, where thecoils of the field magnet are joined inseries with the armature so that the en-tire current passes through these coils. Fig. 457 illustrates a shunt machine,where the field-coil serves as a shunt tothe external circuit. L is the main wireand I is the shunt wire. In the shunt machineonly a ^art of the current generated inthe armature passes throughthe field-coils. A dynamo is said to be self-exciting when thewhole (Fig. 454) or any part(Fig. 457) of the current whichis produced is used to magnet-ize the field magnets. Suchare the Edison incandescentdynamos. The fields, after beingonce excited from anysource, another dynamo,always retain a little re-sidual magnetism, so thatwhen the armature beginsto rotate, a slight currentp
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectphysics, bookyear1895
