Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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GE ad hoc vt lignum è fundo vaſis aſcendat, quod
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conſtat hac experientia: Perforetur
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fundũ
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vaſis GC
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tunc profectò aqua FG, & ei ſuperincumbens FD
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profluet
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deſcendẽdo
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per
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apertũ
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orificium GC, nec
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proindè
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lignũ
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GE
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ſursũ
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aſcẽdet
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, ſed neceſsè eſt ob
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turato foramine GC, vt aqua fluere, & inſinuari poſ
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ſit inter priſmatis baſim BG, & fundum putei, & tune
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aſcendet lignum, ſi nimirùm concipiatur putei fun
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dum magis depreſſum vt eſt MK, & aqua FC proflu
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ens repleuerit ſpatium BMLG ef
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ficietur ſipho DKMA cuius vną
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pars aquea HK grauìor eſt reliqua
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parte AL, & proindè
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maiorẽ
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vim
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compreſſiuam habebit aqua HK,
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quàm aqua, &
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lignũ
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AL, & prop
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terea deprimetur deſcendendo a
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qua FGK eleuabiturque motu
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cõtrario
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aqua LB vnà
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cum ligno incumbente, neceſſariò igitur requiruntur
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hi duo motus contrarij deſcenſus aquæ grauioris FK,
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& aſcenſus aquæ LB vt lignum eleuari poſſit. </
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colligitur, quod vis motiua, quæ impellit ligneum̨
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priſma GE ſursùm eſt profectò grauitas aquæ colla
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teralis FC, ſed quatenùs moueri, atque deſcendere
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poteſt, & præterea quatenus ſursùm impellere va
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let aquam BL, & huic impulſui cedere debet minor
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vis deficientis grauitatis ligni EG, & hæc eſt legiti
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ma, & adæquata cauſa, quare lignum à maiori im
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pulſu aquæ collateralis prementis ſursùm impelli
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tur ab aqua, quæ infra eius baſim inſinuatur. </
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