Motion picture projection : an elementary text book (1928)

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MOTION PICTURE PROJECTION 37 water simply surges, first in one direction, and then in the other, so that a small object suspended in the water would not travel continuously around the pipe line, but would simply oscillate back and forth over a short distance. The importance of the electric current lies in 4 VAtVfe PUMP Pig. 5 Fig. 6 the fact that it is an energy current. A current of water transports energy; so does a current of air. It is the motion that counts, and to utilize the energy of motion we must do something tend