Demonstrates methods of harnessing rivers to provide electrical power, such as water wheels and modern hydro-electric turbines. animation and photography show dams and how their power is utilized. Illustrates various types of water wheels, electric generators, and hydroelectric turbines, and uses animation to explain the operation of the turbine. Compares the availability of coal and water power, shows the relative water-power potentialities of the Colorado and Mississippi Rivers, illustrates many uses of electricity, and depicts other benefits of the harnessing of water power.

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