. Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise. —Allis-Chalmers revolving field self-contained belted type alternator. Motion is purely a relative tnatter, that is, an object issaid to move when it changes its position with some other objectregarded as stationary; it may be moving with respect to a ALTERNATORS 1,147 second object, and at the same time be at rest with respect toa third object.
. Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise. —Allis-Chalmers revolving field self-contained belted type alternator. Motion is purely a relative tnatter, that is, an object issaid to move when it changes its position with some other objectregarded as stationary; it may be moving with respect to a ALTERNATORS 1,147 second object, and at the same time be at rest with respect toa third object. Thus, a dory has a speed of four miles per hourin still water; if it be run up stream against a current flowingfour miles per hour it would move at that speed with respectto the water, yet remain at rest with respect to the earth. It must be evident then that motion, as stated, being a purelyrelative matter, it makes no difference whether the armature. Fig. —Marine view, showing that motion is purely a relative matter. In order thatthere may be motion something must be regarded as being stationary. In the above illus-tration a catboat is shown at anchor in a stream which is flowing at a rate of four milesper hour in the direction of the arrow. The small dory running at a speed of four milesper hour against the current is moving at that velocity relatiie to the cur- .-:. ye: := at astandstill relative to the catboat. In this instance both catboat and dory are movingwith respect to the water if the latter be regarded as stationary. Again if the earth berega-ded as being stationary, the two boats are at rest and the water is moving relativeto the earth. of a generator move with respect to the field magnets, or thefield magnets move with respect to the armature, so far as inducingan electric current is concerned. For alternators of medium and large size there are severalreasons why the armature should be stationary and the fiel
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