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
^See Section 100. 46 MECHANICS OF SOLIDS. … ladder is the weight, applied at its centre of gravity, and thebuilding is the fulcrum of a lever of the third class. Theprincipal muscles of the body act as levers of this class.Thus a weight raised by the hand is lifted by the musclesattached at the elbow. The muscle acts at a great me-chanical…
Physics
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