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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Cap. 4. poſi
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tiuam leui
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tatem noņ
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dari.</
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<
s
id
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">His declaratis accedamus iam ad difficultates ad
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uerſarij, in quibus ſupponit, quòd dum ligneus cy
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lindrus GE exquiſito, & immediato contactu fundo
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vaſis adhæret, ipſumque veluti exoſculatur, licèt vas </
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<
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repletum aqua fuerit, lignum ſponte ſua, & vi eius
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leuitatis ſursùm aſcendere deberet. </
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<
s
id
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">Sed quid facies,
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ſi experimentum huic aſſertioni refragatur? </
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<
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id
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">Et pro
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cùl dubio ſi experimentum ita ſe haberet, vt ab ipſo
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refertur, ſcilicèt ſi cylindrus ligneus GE exquiſitè
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tangens ſuperficiem fundi vaſis BG complanatam,
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& lęuigatam, eſſetque vas aqua repletum, & nihilo
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minus lignum ſursùm aſcenderet, neceſſariò aſſerere
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teneremur, & confiteri, lignum, non à principio ex
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trinſeco per extruſionem, ſed à vi naturali leuitatis
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eius aſcendere. </
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Experimen
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tum falſum
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aduerſarij
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pro leuitate
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poſitiua.</
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PROP. LXXXII.
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Experimentis euincitur non ob defectum leuitatis poſitiuæ,
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ſed quia extruſio à medio fluido grauiori fieri non po
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test, lignum in aquæ fundo quieſcere.
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<
s
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">VErùm quia lignum EG in aqua demerſum non
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aſcendit è fundo vaſis cui adhæret, imò ibidem
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ſiſtitur, & quieſcit, igitur
<
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abbr
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nõ
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ineſt in ligno cauſa ima
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ginata, quæ leuitas poſitiua vocatur. </
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<
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id
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">E contrà quo
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tieſcumque fieri, & exerceri poteſt extruſio medij
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fluidi, ideſt quotieſcumque fluidum grauius fluerę
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poteſt, & inſinuari infra cylindrum ligneum, ſemper
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ſubſequitur effectus aſcenſus illius, at quando (vt </
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