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

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              ret, inuerſa flammæ figuræ eſſet, aut certè inferior pars non
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              minùs quàm ſuperior acuminata, vt fit in omnibus non du­
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              ris quando per expresſionem ſursùm iaciuntur. </s>
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              quin­
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              ta eſſentia vini in lapide accenſa ſursùm fertur non per ex­
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              presſionem, ſed inſita leuitate, aer enim exprimens, vel
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              eſſet ſub baſi ignis auolantis, & illum protruderet, quod eſt
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              falſum; vel ſuperincumbens grauitando hanc
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              efficeret; neque hoc, quia ſic aer vertici ignis incumbens eum
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              deprimeret potiùs, ac reuerberaret deorsùm, quàm ſursùm.
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              Noua argu­
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              menta pro
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              leuitate po­
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              ſitiua
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                tur</expan>
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              Cap. 4. poſi­
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              tiuam leui­
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              tatem noņ
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              dari.</s>
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              PROP. LX.
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            <p type="main">
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              Flammam in camino ab expresſione ambientis aeris
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              ſursùm impelli.
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              <s id="s.000624">PRimæ difficultati, quòd nimirum flamma lucer­
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              næ in aere quieto, & tranquillo moueatur ſur­
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              sùm ſponte, non verò per extruſionem factam ab ae­
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              re ambiente, ſatisfacere nitemur adducendo experi­
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              menta aliqua. </s>
              <s id="s.000625">Videmus enim maiores, & ampliores
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              flammas in caminis accenſas non vigere, nec diutiùs
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              perſeuerare niſi adſit aditus aeri de foris aduenienti,
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              per quem ingrediatur ventus perpetuus, qui inter
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              crura, & fœmora ignem
                <expan abbr="circumſtãtium">circumſtantium</expan>
              excurrit ver­
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              sùs flammam, eſtque euidentèr ſenſibilis, nam ſi cu­
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              biculi oſtium claudatur extenſo panno, vel cortina,
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              vt fieri ſolet, hęc inflatur verſus ignem camini, vt ve­
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              lum nauis; imò in cubiculis vndiquè diligentèr clau­
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              ſis, in quibus aer externus ſubingredi nequeat non
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              poterit flamma ſursùm impelli ab aere, quin cubi-</s>
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        </body>
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