Descartes, René, Renati Des-Cartes principia philosophiae

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            <p type="main">
              <s>
                <pb pagenum="252"/>
              rigidi, ſi percutiantur ab aliquo corpore etiam duro,
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              ſpatia quae multas eorum particulas interjacent, & à
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              globulis ſecundi elernenti ſolent occupari, ſolito fiunt
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              anguſtiora, & ideò iſti globuli exſilire coacti, nihil prae­
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              ter ſolam materiam primi elementi circa
                <arrow.to.target n="marg1577"/>
              relin­
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              quunt; deinde ex eo quòd ſint friabiles, ſimul ac iſtae
                <lb/>
              ſilicum articulae non ampliùs ictu premuntur ab in­
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              vicem diſſiliunt, ſicque materiae primi elementi, quae
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              ſola circa ipſas reperitur, innatantes, ignem compo­
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              nunt. </s>
              <s>Ita, ſi A ſit ſilex, inter cujus
                <arrow.to.target n="marg1578"/>
              particu­
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              las globuli ſecundi elementi conſpicui ſunt, B reprae­
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              ſentabit eundem ſilicem, cùm ab aliquo corpore duro
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              percutitur, & ejus meatus anguſtiores facti, nihil
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              ampliùs niſi materiam primi elementi poſſunt conti­
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              nere; C verò eundem jam percuſſum, cùm
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                <lb/>
              ejus particulae ab eo ſeparatae, ac ſolam materiam pri­
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              mi elementi circa ſe habentes, in ignis ſcintillas ſunt
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              converſae. </s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg1575"/>
              LXXXIV.
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              Quomodo ex ſilicibus
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              excutiatur. </s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg1576"/>
              10</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg1577"/>
              5</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg1578"/>
              10</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg1579"/>
              15</s>
            </p>
            <figure id="fig72" number="75"/>
            <p type="main">
              <s>
                <arrow.to.target n="marg1580"/>
                <lb/>
              Si lignum, quantumvis ſiccum, hoc pacto percutia­
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              tur, non idcirco ſcintillas ita emittet, quia cùm
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                <lb/>
              adeò durum ſit, prima ejus pars quae corpori percu­
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              tienti occurrit, flectitur verſus ſecundam, eamque at­
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              tingit, priuſquam haec ſecunda flecti incipiat verſus ter­
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              tiam. </s>
              <s>Sicque globuli ſecundi elementi non eodem tem­
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              pore ex multis eorum intervallis, ſed ſucceſſivè
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                <lb/>
              ex uno, nunc ex alio diſcedunt. </s>
              <s>Atqui ſi hoc lignum
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              aliquandiu & ſatis validè fricetur, inaequalis ejus par­
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              ticularum agitatio & vibratio, quae oritur ex iſtâ fri­
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              ctione, poteſt ex pluribus earum intervallis globulos
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              ſecundi elementi excutere, ſimulque ipſas ab
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                <lb/>
              disjungere, atque ita in ignem mutare. </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>