Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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in vaſe nedùm deorsùm comprimat, vt grauis, ſed
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etiam non omninò priuetur gradu aliquo leuitatis,
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tunc ſimilitèr libra perpetua imaginaria efformabi
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tur in qua terminus I deorsùm impellitur ab exceſſu
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quo grauitas aquæ D ſuperat
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<
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abbr
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grauitatẽ
">grauitatem</
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ligni F, & è
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cõtràter-minus
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minus</
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B
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ſursũ
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eleuabitur ab ex
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ceſſu quo leuitas ligni ſuperat
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leuitatem ipſius aquæ. </
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<
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prædicti impulſus ſunt contra
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rij, applicanturque eidem li
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bræ imaginariæ, igitur vnus impulſus alteri non op
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ponitur, & proindè vniuerſalis conatus, & impetus
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prædictæ libræ, ſcilicèt vis, & impetus, quo lignum
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F aſcendit in aqua menſuratur ab vtroque exceſſu,
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ſcilicèt ab aggregato differentiæ ponderum aquæ,
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& ligni, vnà cum exceſſu leuitatis ligni ſupra aqueam
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leuitatem. </
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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. 50.</
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SVPPOSITIO V.
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<
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">HIs præmiſſis ſupponamus cum aduerſarijs pri
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mo loco, quòd reuerà præter corpora grauią
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etiam leuia in natura exiſtant, quorum aliqua, vt ait
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Ariſtoteles, ſint ſimplicitèr talia, alia verò reſpectiuè,
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veluti ignis dicitur abſolutè leuis, & terra, ſeù hy
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drargyrum, vel aliud fluidum æquè graue, ac ipſą
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terra eſt appellabitur abſolutè graue
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reperiũtur
">reperiuntur</
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po
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ſtea alia corpora intermedia ſimplicia, vel mixtą,
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quæ vocantur grauia ſimùl, & leuia reſpectiuè, ſcili-</
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