Borelli, Giovanni Alfonso, De motionibus naturalibus a gravitate pendentibus, 1670

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s id="s.000238">
                <pb pagenum="52" xlink:href="010/01/060.jpg"/>
                <arrow.to.target n="marg55"/>
                <lb/>
              propterea quòd niſus grauitatis non exercetur late­
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              raliter, ſed deorsùm. </s>
            </p>
            <p type="margin">
              <s id="s.000239">
                <margin.target id="marg55"/>
              Cap. 3. flui­
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              dum in ſuo
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              toto quie­
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              ſcens pon­
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              derat.</s>
            </p>
            <p type="main">
              <s id="s.000240">Hinc colligitur, quòd quotieſcumque ſupremum
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              lanæ inuolucrum perpendicularitèr incumbens ſu
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              peralterum, ſi ipſum non flecteret, nec ſtringeret,
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              tunc planè affirmandum eſſet lanam ſuperpoſitam̨
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              minimè ſuper ſubiectam lanam grauitatem exercere. </s>
            </p>
            <p type="main">
              <s id="s.000241">His poſitis, ſupremum lanæ inuolucrum applica­
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              ri poteſt ſuper infimum dum hoc actu per aerem mo­
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              uetur deſcendendo deorſum, vel dum quieſcit à pla­
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              no ſtabili fultum; in primo caſu manifeſtum eſt,
                <lb/>
              quòd inuolucra æqualia eiuſdem lanæ æquales gra­
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              dus velocitatum
                <expan abbr="habẽt">habent</expan>
              , quibus naturaliter deſcen­
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              dunt; igitur ſupremum inuolucrum non deſcendet
                <lb/>
              tardiori, vel celeriori motu quàm ſibi
                <expan abbr="ſubiectũ">ſubiectum</expan>
              , pro­
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              indeque æquali velocitare ſuprema lana compri­
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              mere conatur ſubiectam lanam, ac iſta nititur effu­
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              gere perſequentem; proptereaque ſe mutuo placi­
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              do contactu ſolummodò exoſculantur, nec ſubiecta
                <lb/>
              inflectetur, aut comprimetur à ſuperſtante lana:
                <lb/>
              igitur, ex ſuperiùs dictis incumbens lana nequè
                <expan abbr="põ-dus">pon­
                  <lb/>
                dus</expan>
              , neque grauitatem exercebit ſupra fugientem
                <lb/>
              lanam ſubiectam. </s>
              <s id="s.000242">In ſecundo verò caſu ſi poſtquàm
                <lb/>
              in quiete ſubiecta lana compreſſa eſt à ſuperincum­
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              bente ambas demittamus, & liberè deorſum
                <expan abbr="deſcẽ-dere">deſcen­
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                dere</expan>
              concedamus, pateteas motum inchoare quan­
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              do iam reſtrictæ, & conſtipatæ ſunt, & ideò in pro­
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              greſſu licèt paribus velocitatibus deſcendant, reti­
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              n bunt tamen eandem conſtipationem, quam prius </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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