Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667

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              <s>DISCOURSES
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              OF THE
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              MECHANICKS:
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              A MANVSCRIPT of
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              Monſieur Des-Cartes.</s>
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              <s>The Explication.</s>
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              <s>
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              Of Engines, by help of which we may raiſe a very great
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              weight with ſmall ſtrength.
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              <s>The Invention of all theſe Engines de­
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              pends upon one ſole Principle, which is,
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              That the ſame Force that can lift up a
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              Weight, for example, of 100 pounds to
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              the height of one foot, can life up one of
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              200 pounds to the height of half a foot,
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              or one of 400 pounds to the height of a
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              fourth part of a foot, and ſo of the reſt,
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              be there never ſo much applyed to it: and
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              this Principle cannot be denied if we conſider, that the Effect
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              ought to be proportioned to the Action that is neceſſary for the
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              production of it; ſo that, if it be neceſſary to employ an Action by
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              which we may raiſe a Weight of 100 pounds to the height of two
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              foot, for to raiſe one ſuch to the height of one foot only this ſame
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              ought to weigh 200 pounds: for its the ſame thing to raiſe 100
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              pounds to the height of one foot, and again yet another 100
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              pounds to the height of one foot, as to raiſe one of 200 pounds to
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              the height of one foot, and the ſame, alſo, as to raiſe 100 pounds
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              to the height of two feet.</s>
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              <s>Now, the Engines which ſerve to make this Application of a
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              Force which acteth at a great Space upon a
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              W
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              eight which it cau­</s>
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          </chap>
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