Finding out about simple machines / by Gene Darby.
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TextPublication details: Westchester, Ill. : Benefic Press, c1974Description: 47 p. : col. ill. ; 23 cmISBN: 081757431X :Subject(s): Simple machines -- Juvenile literature | Simple machinesDDC classification: 531/.8 LOC classification: TJ147 | .D37Summary: Explains the principles and describes the uses of such simple machines as the pulley, wedge, lever and others.
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Explains the principles and describes the uses of such simple machines as the pulley, wedge, lever and others.
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