Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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Cap. 4. poſi
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tiuam leui
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tatem noņ
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dari.</
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PROP. LVII.
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Si Aer in aqua ſolummodò leuitatem exerceret, in ea non
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aſcenderet à leuitate eius poſitiua impulſus.
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">ET primò ſupponamus prædicta elementa noņ
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retinere ſimùl eodemque tempore duas oppo
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ſitas facultates grauitatis, & leuitatis, ſed ſucceſſi
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uè modò vnam, modò alteram poſſideant, prout in
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diuerſis medijs fluidis collocantur, ſcilicèt aqua iņ
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aere pendula ſolummodò grauis cenſeri debeat, non
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autem leuis, ſi poſtmodum aqua infrà hydrargyrum
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mergatur, tunc aqua leuis ſit, non autem grauis, po
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natur etiam, quod aer, ſeù
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ſub aqua demerſum leue ſit, nec
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grauitatem vllam habeat. </
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cipiatur poſtea vas RGHS a
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qua D plenum, & in eo merga
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tur maſſa aeris, vel ligni F, pa
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tet ergò ex ſupradicta hypo
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theſi, quod aqua D
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leuitatem, ſed tantummo
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dò grauitatem habebit, eò quòd prædicta aqua non
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ſupponitur demerſa intra aliud corpus fluidum den
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ſius, & ponderoſius ipſa, ſed contigua eſt aeri. </
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dò quia aer, vel lignum F ſupponitur ab aduerſarijs
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ſursùm aſcendere à G, versùs R impulſa à poſitiua
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leuitate eius naturali, aqua verò circumfuſa D cona
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tum, atque impetum exercet deorsùm ab A versùs
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H veluti natura eius grauitatis exigit, habebimus </
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