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

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            <p type="main">
              <s id="s.001628">
                <pb pagenum="310" xlink:href="010/01/318.jpg"/>
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                <lb/>
              iacet in plano horizontali, nullo pacto verificari po­
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              teſt, niſi in ipſo fluido ponatur virtus aliqua motiua,
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              qua ſi omninò careat, nullo pacto poterit aqua fluida
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              explanari, & ad libellam horizontalem reduci. </s>
              <s id="s.001629">At
                <lb/>
              huiuſmodi virtus motiua longè diuerſa eſt ab ea, quæ
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              exigitur à Carteſio, eiuſque ſectatoribus, non enim̨
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              eſt motiua virtus vaga, & irregularis, quæ inordina­
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              tam agitationem ſursùm, & deorsùm, & tranſuersè
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              continuato fluxu efficiat, ſed eſt tantummodò vis, at­
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              que impetus naturalis grauitatis, ope cuius particu­
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              læ omnes fluidi æquali niſu
                <expan abbr="tendũt">tendunt</expan>
              , ac feruntur deor­
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              sùm; ſic enim æquatis momentis efficitur
                <expan abbr="æquilibriũ">æquilibrium</expan>
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              partium eiuſdem fluidi, vnde ſubſequitur æqualis di­
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              ſpoſitio earum
                <expan abbr="horizõtalitèr">horizontalitèr</expan>
              ; ſi enim huiuſmodi gra­
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              uitas in fluido deficeret, non poſſet virtute æquilibrij
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              æqualitèr diſponi, ſed vna eius pars depreſſa, alia ve­
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              rò ſublimis efficeret inæqualem, & aſperam ſuperfi­
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              ciem externam eius, compoſitam ex vallibus, &
                <expan abbr="mõ-tibus">mon­
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                tibus</expan>
              . </s>
              <s id="s.001630">Neceſſariò ergò fatendum eſt in hiſce fluidis
                <lb/>
              noſtratibus vim motiuam aliquam adeſſe vt omnes
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              æquali vi, & impetu, ad eaſdem partes, ſcilicèt deor­
                <lb/>
              sùm tendant. </s>
              <s id="s.001631">Et profectò ſi ponerentur motus vagi
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              irregulares, & contrarij in eodem corpore fluido, vt
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              aduerſarij exiſtimant, ſequeretur deſtructio
                <expan abbr="eiuſdẽ">eiuſdem</expan>
                <lb/>
              hypotheſis, nam cùm in eadem aqua v. g. non poſ­
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              ſint omnes particulæ eiuſdem aquæ ex condicto ſi­
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              mul ad eaſdem partes ordinata ſeriè moueri, vt iņ
                <lb/>
              progreſſu alicuius cohortis, vel vt in ſupplicationi­
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              bus fieri ſolet, omninò neceſsè eſt, vt aliæ partes </s>
            </p>
          </chap>
        </body>
      </text>
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