Casati, Paolo, Terra machinis mota : dissertationes geometricae, mechanicae physicae hydrostaticae

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      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb xlink:href="018/01/164.jpg" pagenum="150"/>
              uitatis aquæ exſuctæ ad eiuſdem aëris graui­
                <lb/>
              tatem; modò hæc aquæ grauitas intelligatur
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              non in quocunque medio, ſed in eodem, in
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              quo aër communis grauis eſt, in aëre vide­
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              licet ignito & rariſſimo. </s>
              <s>Verùm cum re­
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              rum grauitates definiamus habitâ rationę
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              medij omnium rariſſimi atque leuiſſimi ex
                <lb/>
              ijs, quibus communiter vtimur, hoc autem
                <lb/>
              medium aër ſit, non video, cur aëris &
                <lb/>
              aquæ grauitates inuicem conferre oporteat
                <lb/>
              ratione medij, cuius nullus futurus eſt vſus. </s>
              <s>
                <lb/>
              Quod ſi metalla aquæ immerſa dicuntur in
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              aquâ minùs grauitare pro ratione diſcrimi­
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              nis, quod interſpecificas grauitates interce­
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              dit; cum aquam inter & aquam, aut aërem
                <lb/>
              inter &
                <expan abbr="aẽrem">aerrem</expan>
              nulla reperiatur communiter
                <lb/>
              differentia, nulla pariter aquæ in aquâ aut aë­
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              ris in aëre eſt grauitatio: ac proinde cum
                <lb/>
              aër in aëre conſtituatur, nulla eſt eius graui­
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              tas, quam cum aquâ comparare oporteat. </s>
            </p>
            <p type="main">
              <s>Sed & vnum præterea addo, ſi placet. </s>
              <s>
                <lb/>
              Si ferri grauitatem cum aquæ grauitate con­
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              ferre voluero, ferrum primùm in aëre ex­
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              pendo, deinde in aquâ; & quæ fuerit pon­
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              derum differentia, eam tribuo grauitati aquæ
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              ſecundùm molem æqualis ferro; & vt totum
                <lb/>
              ferri pondus ad hanc differentiam, ita graui­
                <lb/>
              tatem ferri ad aquæ grauitatem ſecundùm </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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