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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<
s
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">Et hinc apertè conijcio non benè perceptum fuiſ
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ſe modum quomodò medium fluidum ſursùm impel
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lat
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extrudatq;
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lignum minùs graue ipſa aqua, & ideò
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operæpretium erit apertè, & diſtinctè hoc declarare. </
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PROP. LXXX.
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Niſi lignum, & ambiens aqua collateralis motibus contra
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rijs ſursùm, & deorsùm ſimul tempore moueri que
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ant, numquam lignum in aqua aſcendet.
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61
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<
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id
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">SIt vas ABCD aqua plenum iņ
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cuius fundo apponatur priſma
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ligneum EFGB hìc adeſt aqua li
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gno incumbens AEFH, atque aqua
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collateralis HFID, quæ comprimit
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ſubiectum aqueum priſma FICG,
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Dico primò, quod ſuperincumbens
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aqua AEFH nequaquàm ſursùm impellit ſubiectum
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lignum, imò id comprimit: neque præterea ſuperna
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collateralis aqua HFID prædictum lignum eleuat,
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ſed tantummodò æquilibratur cum collaterali aqua
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AEFH. </
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<
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id
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">Tantummodò ad rem noſtram facit aquą,
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quæ ad latus ipſius ligni apponitur, FGCI, & hæc
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abbr
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nõ
">non</
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ſemper ſubleuare poteſt lignum BF, niſi habuerit
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duas conditiones, primò vt aqua FC deſcenderę
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deorsùm valeat, ſecundò vt eodem tempore eadem
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aqua lignum GE impellere ſursùm poſſit. </
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<
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id
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">At quan
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dò huiuſmodi motus contrarij ob aliquod impedi
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mentum fieri ſimùl
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abbr
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nõ
">non</
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poſſunt, omninò lignum quie-</
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