Quotation from: General Science

Written by: Bertha M. Clark


If all mankind had depended upon physical strength only, the world
to-day would be in the condition prevalent in parts of Africa, Asia,
and South America, where the natives loosen the soil with their hands
or with crude implements (Fig. 94), and transport huge weights on
their shoulders and heads.


[Illustration: FIG. 92.--The wheelbarrow lightens labor.]


Any mechanical device (Figs. 95 and 96), whereby man's work can be
more conveniently done, is called a machine; the machine itself never
does any work--it merely enables man to use his own efforts to better
advantage.

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