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

Table of figures

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      <text>
        <body>
          <chap>
            <pb xlink:href="040/01/977.jpg" pagenum="283"/>
            <p type="main">
              <s>From the Inſtrument laſt deſcribed, the other Inſtrument which
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              we call the Crane is not much different, as to form, nay, differeth
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              nothing, ſave in the way of applying or employing it: For that the
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              Capſten moveth and is conſtituted perpendicular to the Horizon,
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              and the Crane worketh with its Moment parallel to the ſame Ho­
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                <figure id="id.040.01.977.1.jpg" xlink:href="040/01/977/1.jpg" number="187"/>
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              rizon. </s>
              <s>For if upon the Circle D A E we ſuppoſe an Axis to be
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              placed Column-wiſe, turning about the Center B, and about which
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              the Rope D H, faſtened to the Weight that is to be drawn, is be­
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              laid, and if the Bar F E B D be let into the ſaid Axis [
                <emph type="italics"/>
              by the Mor­
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              tace B
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              ] and the Force of a Man, of an Horſe, or of ſome other
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              Animal apt to draw, be applyed at its end F, which moving round,
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              paſſeth along the Circumference F G C, the Crane ſhall be framed
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              and finiſhed, ſo that by carrying round the Bar F B D, the Barrell
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              or Axis E A D ſhall turn about, and the Rope which is twined a­
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              bout it, ſhall conſtrain the Weight H to go forward: And becauſe
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              the point of the Fulciment about which the Motion is made, is the
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              point B, and the Moment keeps at a Diſtance from it according to
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              the Line B F, and the Reſiſtor at the Diſtance B D, the Leaver
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              F B D is formed, by vertue of which the Force acquireth Moment
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              equall to the Reſiſtance, if ſo be, that it be in proportion to it, as
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              the Line B D is to B F, that is, as the Semidiameter of the Axis to
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              the Semidiameter of the Circle, along whoſe Circumference the
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              Force moveth. </s>
              <s>And both in this, and in the other Inſtrument we
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              are to obſerve that which hath been frequently mentioned, that is,
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              That the benefit which is derived from theſe Machines, is not that
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              which the generality of the Vulgar promiſe themſelves from the
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              Mechanicks; namely, that being too hard for Nature, its poſſible </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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