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

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            <p type="main">
              <s id="s.000139">
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            <p type="margin">
              <s id="s.000140">
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              Cap. 2. dę
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              momentis
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              grauium in
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              fluido inna­
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              tantium.</s>
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            <p type="main">
              <s id="s.000141">
                <emph type="center"/>
              PROP. XI.
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              </s>
            </p>
            <p type="main">
              <s id="s.000142">
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              Si verò corpus ſolidum ponitur ſupra aquæ libellam,
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              tunc deſcenſus communis centri grauitatis non
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              efficietur per lineam perpendicularem ad
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              horizontem ſed motu curuo per
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              parabolam.
                <emph.end type="italics"/>
                <emph.end type="center"/>
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            <p type="main">
              <s id="s.000143">IN progreſſu prædictæ operationis notabilis eſt va­
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              riatio ſitus centri grauitatis eius & mechanicæ eius
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              operationis. </s>
            </p>
            <p type="main">
              <s id="s.000144">Sit igitur in eodem vaſe priſma ligneum ABCD
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              perductum ad ſupremam aquæ libellam RX, tunc ſi­
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              militer inter ſe comparantur duo priſmata BD ligno­
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              um, & AH aqueum in eodem plano horizontali ſu­
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              biecto HC inſiſtentes, & proindè
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                <figure id="id.010.01.037.1.jpg" xlink:href="010/01/037/1.jpg"/>
                <lb/>
              efficitur libra imaginaria PO mo­
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              bilis circa eius fulcimentum Q, &
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              centrum grauitatis
                <expan abbr="eorumdẽ">eorumdem</expan>
              cor­
                <lb/>
              porum cadit ad partes aquæ nem­
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              pè in Y inter
                <expan abbr="cẽtrum">centrum</expan>
              Q & extremitatem radij P. hinc
                <lb/>
              ergo ſe quitur vt prædicta libra flecti debeat deorsùm
                <lb/>
              ad partes Y & ſurſum aſcendat terminus O vnà cum li­
                <lb/>
              gno versùs aquæ libellam ſupremam RX, igitur por­
                <lb/>
              tio aliqua ligni ſuprema eleuabitur ſupra prædictam
                <lb/>
              aquæ libellam, vt patet in poſtrema figura, & tunc
                <lb/>
                <expan abbr="quidẽ">quidem</expan>
              ſucceſſiuè imminuitur priſma
                <expan abbr="aqueũ">aqueum</expan>
              GD prout
                <lb/>
              magis ligneum priſma exurgit, eminetque ſupra aquę
                <lb/>
              libellam, & in prædicto aſcenſu dum collaterale priſ-</s>
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