Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb xlink:href="039/01/033.jpg" pagenum="5"/>
              centro vis gravitantis) ſive alia aliqua quæ non apparet. </s>
              <s>Mathe­
                <lb/>
              maticus duntaxat eſt hic conceptus. </s>
              <s>Nam virium cauſas & ſedes phy­
                <lb/>
              ſicas jam non expendo. </s>
            </p>
            <p type="main">
              <s>Eſt igitur vis acceleratrix ad vim motricem ut celeritas ad mo­
                <lb/>
              tum. </s>
              <s>Oritur enim quantitas motus ex celeritate ducta in quanti­
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              tatem materiæ, & vis motrix ex vi acceleratrice ducta in quantita­
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              tem ejuſdem materiæ. </s>
              <s>Nam ſumma actionum vis acceleratricis in
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              ſingulas corporis particulas eſt vis motrix totius. </s>
              <s>Unde juxta
                <lb/>
              ſuperficiem Terræ, ubi gravitas acceleratrix ſeu vis gravitans in
                <lb/>
              corporibus univerſis eadem eſt, gravitas motrix ſeu pondus eſt ut
                <lb/>
              corpus: at ſi in regiones aſcendatur ubi gravitas acceleratrix fit mi­
                <lb/>
              nor, pondus pariter minuetur, eritque ſemper ut corpus in
                <lb/>
              gravitatem acceleratricem ductum. </s>
              <s>Sic in regionibus ubi gravitas
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              acceleratrix duplo minor eſt, pondus corporis duplo vel triplo
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              minoris erit quadruplo vel ſextuplo minus. </s>
            </p>
            <p type="main">
              <s>Porro attractiones & impulſus eodem ſenſu acceleratrices & mo­
                <lb/>
              trices nomino. </s>
              <s>Voces autem Attractionis, Impulſus, vel Propen­
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              ſionis cujuſcunQ.E.I. centrum, indifferenter & pro ſe mutuo pro­
                <lb/>
              miſcue uſurpo; has vires non Phyſice ſed Mathematice tantum con­
                <lb/>
              ſiderando. </s>
              <s>Unde caveat lector, ne per hujuſmodi voces cogitet me
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              ſpeciem vel modum actionis cauſamve aut rationem Phyſicam ali­
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              cubi definire, vel centris (quæ ſunt puncta Mathematica) vires
                <lb/>
              vere & Phyſice tribuere; ſi forte aut centra trahere, aut vires cen­
                <lb/>
              trorum eſſe dixero. </s>
            </p>
            <p type="main">
              <s>
                <emph type="center"/>
                <emph type="italics"/>
              Scholium.
                <emph.end type="italics"/>
                <emph.end type="center"/>
              </s>
            </p>
            <p type="main">
              <s>Hactenus voces minus notas, quo ſenſu in ſequentibus acci­
                <lb/>
              piendæ ſint, explicare viſum eſt. </s>
              <s>Nam Tempus, Spatium, Locum
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              & Motum, ut omnibus notiſſima, non definio. </s>
              <s>Notandum tamen, quod
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              vulgus quantitates haſce non aliter quam ex relatione ad ſenſibilia
                <lb/>
              concipiat. </s>
              <s>Et inde oriuntur præjudicia quædam, quibus tollendis
                <lb/>
              convenit eaſdem in abſolutas & relativas, veras & apparentes, ma­
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              thematicas & vulgares diſtingui. </s>
            </p>
            <p type="main">
              <s>I. </s>
              <s>Tempus Abſolutum, verum, & mathematicum, in ſe & natura
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              ſua
                <expan abbr="abſq;">abſque</expan>
              relatione ad externum quodvis, æquabiliter fluit,
                <expan abbr="alioq;">alioque</expan>
                <lb/>
              nomine dicitur Duratio: Relativum, apparens, & vulgare eſt ſenſibilis
                <lb/>
              & externa quævis Durationis per motum menſura (ſeu accurata
                <lb/>
              ſeu inæquabilis) qua vulgus vice veri temporis utitur; ut Hora,
                <lb/>
              Dies, Menſis, Annus. </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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