Quotation from: General Science

Written by: Bertha M. Clark


For generations running water from rivers, streams, and falls has
served man by carrying his logs downstream, by turning the wheels of
his mill, etc.; and in our own day running water is used as an
indirect source of electric lights for street and house, the energy of
the falling water serving to rotate the armature of a dynamo (Section
310).


[Illustration: FIG. 119.--The windmill pumps water into the troughs
where cattle drink.]

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