Motion picture projection : an elementary text book (1928)

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34 MOTION PICTURE PROJECTION driver may know instantly whether he is exceeding the speed limit, and govern himself as he sees fit. The other instrument shows how many miles have been covered on the trip, and of course the average speed may be calculated from its indications, if the length of the trip has been timed. The instrument of measuring total quantity of PCMP JJKY CC1.L. Fig. 3 Fig. 4 electricity corresponds to the recorder of the total miles traversed; the ammeter corresponds to the speedometer. Electromotive Force. — The water will not flow in the pine line, Fig. 3, unless there is some force