Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . Fig. 313.—SiemensShuttle Armature. Cross-section ofShuttle Fig. 314—Single Ar-mature Coil withTwo-part Com-mutator. the permanent magnets, NS, and called a magneto generator, because the field is produced by permanent magnets. Only one turn is illustrated, but the shuttle is filled with wire, as in the cross-sectional view. This construction is only employed in small machines, Fig. 318, such as those used for magneto telephone call systems, and magnetos used in testing ins
Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . Fig. 313.—SiemensShuttle Armature. Cross-section ofShuttle Fig. 314—Single Ar-mature Coil withTwo-part Com-mutator. the permanent magnets, NS, and called a magneto generator, because the field is produced by permanent magnets. Only one turn is illustrated, but the shuttle is filled with wire, as in the cross-sectional view. This construction is only employed in small machines, Fig. 318, such as those used for magneto telephone call systems, and magnetos used in testing insulation of lines, U 256. In dynamos for generating large currents, a stronger field must be employed and the armature core laminated to prevent excessive loss of energy by eddy currents, etc. 323. Simple Direct Current Dynamo.—When it is de-sired to have the current from a generator flow always in onedirection in the external circuit, like a battery current, forsuch purposes as charging accumulators, electroplating, etc., DYNAMO ELECTRIC MACHINES. 343
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