Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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vt nimirùm eius baſis FG perducatur ad
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fi
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ſtulæ D, ita tamen vt perfectè aſſarium FG contingat
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internam fiſtulæ ſuperficiem, vt ne rimula quidem re
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maneat per quam aeri ſupremo ingreſſus pateat; tunc
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in ſpatio FD, neque aer, neque aliud corpus remane
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ret, dum contrapoſita fiſtula AB eſt plena aquæ, & hæc
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procùl dubio ſua naturali grauitate impellet ſursùm
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aquam ab F vſque ad D, nulla alia de cauſa, niſi quia
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in bilance BC maius pondus aquæ AB impellere ſur
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sùm debet contrapoſitum minus pondus. </
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<
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hac operatione nonne ſtultè ratiocinaretur is, qui di
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ceret aquam FC aſcendere ſursùm ad occupandum̨
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ſpatium FD contra inclinationem naturalem ſuę gra
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uitatis, ad hoc vt repleat prædictum ſpatium ne inane
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admittatur in natura? </
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<
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">& ratio eſt quia non poteſt in
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dubium reuocari cauſa phyſica, & realis, quæ author
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eſt huius operationis, nempè maius pondus contra
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poſitæ aquæ AB, quæ in ſiphone, & bilance neceſſita
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te mechanica apta nata eſt impellere ſursùm aquam
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FC vſque ad D. </
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Cor. pro. </
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Cap. 12. dę
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vacui neceſ
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ſitate.</
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PROP. CCLII.
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Si in syringa intra puteum demerſa embolum ab eius fundo
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ſursùm retrahatur, aqua ſubiecta aſcendet, non quidem
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ob metum vacui, ſed necesſitate mechanica à pondere co
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lumnæ aquæ collateralis impulſa.
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<
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ænea syringa EDC, & hæc intra pu
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teum RSTV perpendicularitèr ad horizontem orę
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deorsùm vergente immittatur, quouſque infimum̨ </
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