Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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culares quales ſunt illæ quæ à fune-pendulis deſcri
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buntur, & in prædicto motu vertiginoſo eſt tam ne
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ceſſarius, & naturalis aſcenſus partis minus grauis B
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per arcum BF quemadmodum neceſſarius eſt lapſus
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& deſcenſus totius grauis per arcum DE vſque ad lo
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cum infimum E & licet aſcenſus prædictæ portionis
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B vulgo cenſeatur motus violentus, nihilominus ſi
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perpendatur vertigo, & debita ſituatio corporis gra
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uis quatenus naturalis eſt & naturali inſtinctu acqui
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ſita, & producta; cùm ſit impoſſibile vt prædicta ſitua
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tio debita abſolute conſequatur abſque aſcenſu por
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tionis B ſitque verum quoque quod, qui vult finem̨
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velit quoque neceſſe eſt media, quæ ad finem conſe
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quendum neceſſaria
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; hinc rationabiliter inferetur
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à vi naturali verè impelli minus graue ſurſum verſus
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F, ac proindè concedendum erit aſcenſum per BF
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naturalem prorſus eſſe vel potius in eadem naturali
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operatione includi debere violentiam motus præ
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dicti aſcenſus; ſed vtcunque ſit ſufficit nobis vt præ
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dicta operatio ſit neceſſaria, ſit que prorſus impoſſibi
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le vt aliter contingat; cæteri verò eam vocent ſiue na
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turalem, ſiue violentam ad eorum libitum. </
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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</
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PROP. II.
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Idipſum verificatur in fluidis contentis in
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eodem ſiphone circulari.
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<
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conſtituantur non ſemper eſt neceſſe vt corpora </
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