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

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              <s id="s.000576">
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              53.) conatus, & impetus totalis, quo ignis per mer­
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              curium aſcendit, vel terra per ignem deſcendit, men­
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              ſurari debet ab aggregato virium extremarum, ſci
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              licet à tota vi leuitatis cum tota vi grauitatis, quarę
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              totalis impetus erit octo graduum. </s>
              <s id="s.000577">Sed hoc eſt fal­
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              ſum, contra aduerſarij aſſertionem, & contra Archi­
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              medem, ea enim, quæ in fluido eleuantur, tanta vi
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              aſcendunt, quanta eſt grauitas qua moles fluidi mer­
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              curialis æqualis corpori igneo intra ipſum demerſo
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              ſuperat huius grauitatem, quæ nulla eſt, & proindè
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              ignis impetu quatuor graduum per mercurium
                <expan abbr="aſcẽ-dit">aſcen­
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                dit</expan>
              , quaproptèr non fertur ignis ſursùm à vi eius le­
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              uitatis, & ideò leuis non erit, quod erat &c.
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              Suppoſitio­
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              nes aliquæ
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              peripatetice
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              recenſentur.</s>
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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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              <s id="s.000580">
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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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              Dubitatur
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              de menſura
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              gradus præ­
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              dicti impe­
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              tus.</s>
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            <p type="main">
              <s id="s.000582">Sed inſtabit denuò peripateticus, dicetque, quòd
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              ea velocitas, quæ exercetur ab igne aſcendente per
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              mercurium, aut à terra deſcendente per ignem po­
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              terit cenſeri octo graduum, vel quatuor ad libitum,
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              quia non habemus certam menſuram vnius gradus
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              impetus, & ſic mediante ſenſu, & experientia non
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              poteſt eius ſententia redargui. </s>
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            <p type="main">
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                <emph type="center"/>
              PROP. LVI.
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              </s>
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              Reperire menſuram certi gradus impetus reſpectu cuius di­
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              ſcerni valeat an impetus deſcenſus terræ per ignem,
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              vel aſcenſus ignis per mercurium ſit octo, vel
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              quatuor graduum.
                <emph.end type="italics"/>
                <emph.end type="center"/>
              </s>
            </p>
            <p type="main">
              <s id="s.000585">SEd prædictùm effugium ſic refellemus: Fiat ex­
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              perimentum non in mercurio ſimplicitèr graui, </s>
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          </chap>
        </body>
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