Descartes, René, Renati Des-Cartes principia philosophiae

Table of figures

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb pagenum="185"/>
              rationem ob quam carbones extincti videntur nigri,
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              non aliam eſſe quàm quòd omnis eorum ſuperficies,
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              tam interna quàm externa, particulis iſtis tertii ele­
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              menti mollioribus contecta ſit; quae particulae mol­
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                <arrow.to.target n="marg1150"/>
              liores cùm ignis vi à reliquis ſeparantur, carbones,
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              qui nigri erant, in cineres, non niſi ex duris & ſolidis
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              particulis conflatos atque ideò albos, mutantur; &
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              nulla ſunt corpora reflectendis radiis magis apta quàm
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              alba, nulla minùs quàm nigra. </s>
              <s>Tertiò, ut putemus
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                <arrow.to.target n="marg1151"/>
              partem illam rariorem Cometae, aliâ minùs aptam eſſe
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              ad motum, & ideô, juxta leges Mechanicae, debere
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              ſemper eſſe in concavâ parte lineae curvae, quam
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              Cometa motu ſuo deſcribit: quia ſic alià paulò tar­
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              diùs incedit, & cùm lineae iſtius cavitas ſemper reſpi­
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                <arrow.to.target n="marg1152"/>
              ciat centrum vorticis in quo eſt Cometa (ut hîc cavi­
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              tas ejus partis N C 2 reſpicit centrum S, cavitas partis
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              2 3 4 reſpicit F &c.), ideò illum ex uno vortice in alium
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              tranſeundo converti. </s>
              <s>Ut videmus in ſagittis per ae
                <gap/>
              rem
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              volantibus, pennatam earum partem eſſe ſemper aliâ
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                <arrow.to.target n="marg1153"/>
              inferiorem cùm aſcendunt, & ſuperiorem cùm deſcen­
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              dunt. </s>
              <s>Denique plures aliae rationes dari poſſent, cur
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              Cometae à nobis non videantur, niſi quamdiu tran­
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              ſeunt per noſtrum coelum: ex minimis enim momentis
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              pendet, ut idem corpu radiis reflectendis aptum ſit
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                <arrow.to.target n="marg1154"/>
              vel ineptum: & de ejuſmodi particularibus effectis, de
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              quibus ſatis multa experimenta non habemus, ſufficere
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              debent veriſimiles cauſae, licet eae fortè non ſint verae. </s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg1141"/>
              CXXXII.
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              Cur Cometae à nobis
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              non videantur, cùm
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              ſunt extra noſtrum
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              caelum: & obiter, cur
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              carbones ſint nigri,
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              4& cineres albi. </s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg1142"/>
              25</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg1143"/>
              30</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg1144"/>
              5</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg1145"/>
              5</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg1146"/>
              10</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg1147"/>
              15</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg1148"/>
              20</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg1149"/>
              25</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg1150"/>
              5</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg1151"/>
              10</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg1152"/>
              15</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg1153"/>
              20</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg1154"/>
              25</s>
            </p>
            <figure id="fig49" number="50"/>
            <p type="main">
              <s>
                <arrow.to.target n="marg1155"/>
                <lb/>
              Praeter haec autem, obſervatur etiam circa Come­
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              tas, longèam radiorum veluti comam fulgere, 'a quâ
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                <arrow.to.target n="marg1156"/>
              nomen ſuum accepertunt; atque iſtam comam ſemper </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>