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

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              Quæſt. 19.</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.000453">Sed inſtat aduerſarius quomodo poteſt grauitas
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              efficere impetum quo pila aſcendit ſi videmus
                <expan abbr="motũ">motum</expan>
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              prædictum aſcenſus ſenſim debilitari, & tandem ex­
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              tingui ſolummodo propter renitentiam, & contra­
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              riam actionem, quam efficit pondus eiuſdem pilæ?
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              </s>
              <s id="s.000454">Et hìc aio, quòd exercitium eiuſdem ponderis, ſcili­
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              cèt compreſſio eius producit duos effectus contra­
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              rios, primò per deſcenſum creat, fouet, & auget im­
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              petum eius, poſteà per aſcenſum ei contranititur,
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              debilitat, atque deſtruit eum, & licèt hoc mirabilę
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              videatur, nihilominùs idipſum concedant neceſsè
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              eſt, velint, nolint, cùm ſenſu conſtet, ſic eadem manus
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              impellendo ſaxum dum deorsùm decidit, auget mul­
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              tiplicatque eius impetum, at ſi ſaxum ſursùm aſcen­
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              deret eadem manus contrario motu impetum eius
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              debilitaret, atque deſtrueret. </s>
              <s id="s.000455">ſimilitèr idem calor
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              Solis generat, & auget plantas, & poſtea eas exic­
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              cat extinguitque. </s>
              <s id="s.000456">Ex his ergò patet inſufficientią
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              ſuperiùs adducti ratiocinij. </s>
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              PROP. XLI.
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              Ab eodem principio grauitatis aſcenſio, & ſubleuatio cor­
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              porum leuium effici poteſt.
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              <s id="s.000459">SEd redeo iam ad propoſitum, & alia ratione
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                dem</expan>
              propoſitionem perſuadere conabor. </s>
              <s id="s.000460">Vul­
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              gatiſſimum axioma omnium
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              eſt, quòd
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              natura ſemper producit ſuas operationes via breuiſ­
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              ſima, ſummo compendio, atque abhorret à prolixi-
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