The elements of mechanics, comprehending statics and dynamics (1848)
Young, J. R. (John Radford), 1799-1885, Williams, John D., ed · Philadelphia, E.H. Butler & Co · leaf 122
wo classes; those intended simply tosustain a weight, and those intended to draw it, or raise it equably.In machines of the first class, both the effect of the machine andthe immediate effect of the power can only be estimated by theweight sustained. This being understood it is evident that… … ON THE MECHANICAL POWERS. 105 If it be asked how the force can ever produce an effect so muchgreater than itself, we shall perceive, if we consider well, that theforce 10 does not really sustain the whole weight 100, but only thetenth part of it. Let the lever be supposed to be of the second kind…
Mechanics, Analytic
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