Hallberg, Josef Henrik, 1874- · New York city, The Moving picture world · leaf 43
direction. This analogy shows you in the simplest possible wayhow an alternating current, whether represented by wateror electricity, actually stands still or rather is inactive atthe instant the flow of the current is being reversed; inother words., there is no current, no pressure or no voltageat… … Fig. 7 is also a device mounted on the armature shaft and con-nected to the armature windings called the commutatorand there are also two or more brushes which collect thecurrent generated by the armature through the commu- MOTION PICTURE ELECTRICITY 37 tator. Practically all direct current…
Motion picture theaters · Electric lighting
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