Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 56
-plied only when great weights areto be moved a short distance. Thepowerful scales used for weighingFie-47- hay and coal are arrangements of compound levers. 164. The Pulley is a cord bent around a support, sochanging its direction. A wheel with equalarms, which is a lever, is usually used to…
Physics
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