Philosophical instructor, or, Webster's elements of natural philosophy : subdivided into principles and illustrations ; intended for academies, medical schools, and the popular class-room (1824)
Eaton, Amos, 1776-1842, Webster, John, fl. 1804-1824 · Albany : Printed by Websters and Skinners ... · leaf 48
ction of the ani-mal body ; for the bones are levers, the joints of themthe fulcra, and the muscles the power that gives mo-tion to the whole. It is always employed to expeditemotion at the expense of power. Wheel and Jlxis. The wheel and axis is a perpetual lever, having itsfulcrum in the centre… … radius of which is six inches, and ab, 48 inches, the semidiameter ofthe wheel: then a weight of eightpounds suspended from a, will becounterbalanced by one poundhanging from b ; for as the actingpart of the lever, or radius of thewheel, is eight times as long as theresisting part, or radius of the…
Physics
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