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 (1914)
Hawkins, N. (Nehemiah), 1833- · New York, T. Audel · leaf 159
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… … Fig. 1.303. —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…
Electrical engineering
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