Galilei, Galileo, Les méchaniques, 1634

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          <chap>
            <p type="main">
              <s id="s.000224">
                <pb pagenum="45" xlink:href="047/01/065.jpg"/>
              dont la poulie ABC ſe tourne au tour
                <lb/>
                <figure id="id.047.01.065.1.jpg" xlink:href="047/01/065/1.jpg" number="18"/>
                <lb/>
              du centre G, auquel le far­
                <lb/>
              deau H eſt attaché. </s>
              <s id="s.000225">L'au­
                <lb/>
              tre poulie ſuperieure eſt
                <lb/>
              FE; outre leſquelles il
                <lb/>
              faut encore conſiderer la
                <lb/>
              chorde IBCAEFD, qui
                <lb/>
              eſt attachée au point B, &
                <lb/>
              puis la force qui eſt en I,
                <lb/>
              laquelle ne ſupportera
                <lb/>
              que le tiers du fardeau H. </s>
              <s id="s.000226">
                <lb/>
              Par où il eſt
                <expan abbr="euidẽt">euident</expan>
              qu' AB
                <lb/>
              eſt vn leuier, & que la for­
                <lb/>
              ce I s'applique à ſes extre­
                <lb/>
              mitez B, & A. </s>
              <s id="s.000227">G eſt le
                <lb/>
              point du ſouſtien, auquel
                <lb/>
              H eſt ſuſpendu. </s>
              <s id="s.000228">Vne autre force eſt en­
                <lb/>
              core appliquèe en D, de ſorte que le
                <lb/>
              poids eſt arreſté par 3. chordes qui con­
                <lb/>
              tribuent également à ſouſtenir le poids
                <lb/>
              H: car la force D eſt appliquée au mi­
                <lb/>
              lieu du leuier, & B à ſon extremité, c'eſt
                <lb/>
              pourquoy chaque force ne ſupporte
                <lb/>
              que le tiers du poids H. D'où il s'enſuit
                <lb/>
              que la force I ayant ſon moment égal
                <lb/>
              audit tiers, peut ſouſtenir, & leuer le
                <lb/>
              poids entier. </s>
              <s id="s.000229">Mais I fera trois fois au­
                <lb/>
              tant de chemin que le poids H, parce </s>
            </p>
          </chap>
        </body>
      </text>
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