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

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      <text>
        <body>
          <chap>
            <p type="main">
              <s id="s.000822">
                <pb pagenum="163" xlink:href="010/01/171.jpg"/>
                <arrow.to.target n="marg207"/>
                <lb/>
              ſe ſumptum, tamen ſi grauitas ſpecifica conſidere­
                <lb/>
              tur, erit aggregatum ex oleo, & aere minùs graue,
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              quàm oleum ſolum, quia nempè pondus aggregati
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              ex oleo & aere, minorem proportionem habet ad
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              grauitatem molis aqueæ ei æqualis, quàm pondus
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              ſolius olei habeat ad
                <expan abbr="grauitatẽ">grauitatem</expan>
              aquæ molis prædicto
                <lb/>
              oleo æqualis, ſcilicèt ſi aggregati ex oleo, & aere
                <lb/>
              grauitas ſubdupla fuerit pondere molis aquæ ſibi æ­
                <lb/>
              qualis, pondus olei ſolius maius erit medietate
                <expan abbr="põ-deris">pon­
                  <lb/>
                deris</expan>
              molis aquæ oleo æqualis, & hinc ſit vt maiori
                <lb/>
              impetu ſursùm per expreſſionem impellatur aggre­
                <lb/>
              gatum ex oleo & aere à ſuperabundanti grauitate
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              aquæ circumfuſæ, quæ maiori differentia ſpecificam
                <lb/>
              grauitatem eius ſuperat, quàm moueatur oleum ſur­
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              sùm extruſum à pondere minùs excedenti eiuſdem̨
                <lb/>
              aquæ ambientis. </s>
              <s id="s.000823">Et hoc quidem ſi ritè percipiatur,
                <lb/>
              tollentur, & euaneſcent omnes difficultates, quæ
                <lb/>
              contra prædictam doctrinam afferri poſſunt. </s>
            </p>
            <p type="margin">
              <s id="s.000824">
                <margin.target id="marg206"/>
              Cap. 4. poſi­
                <lb/>
              tiuam leui­
                <lb/>
              tatem noņ
                <lb/>
              dari.</s>
            </p>
            <p type="margin">
              <s id="s.000825">
                <margin.target id="marg207"/>
              Cap. 4. poſi­
                <lb/>
              tiuam leui­
                <lb/>
              tatem noņ
                <lb/>
              dari.</s>
            </p>
            <p type="main">
              <s id="s.000826">Præter ea, quæ iam dicta ſunt affert idem author
                <lb/>
              alia experimenta ex quibus putat euidentèr deduci
                <lb/>
                <arrow.to.target n="marg208"/>
                <lb/>
              poſſe exiſtentiam leuitatis poſitiuæ, quia inquit:
                <lb/>
                <emph type="italics"/>
              Cylindrus ligneus è fundo aquæ ſursùm tanto impetu fertur
                <lb/>
              vt multotiès exiliat totus ſupra aquam ille igitur ſaltus in­
                <lb/>
              dicium eſt impetus ab intrinſeca leuitate facti, quia aqua
                <lb/>
              non poteſt illud vltrà trudere quam ſit ipſi opus vt locum
                <lb/>
              inferiorem occupet niſi ipſa ſursùm priùs feratur, quod eſt
                <lb/>
              contra ipſius grauitatem.
                <emph.end type="italics"/>
              </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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