Borelli, Giovanni Alfonso, De motionibus naturalibus a gravitate pendentibus, 1670

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Hoc poſito, ſi in eodem vaſe exiſtente aqua in ſpa-
tio ABHG intelligatur collaterale priſma AGFI ab
aere repleri, vel à quolibet alio fluido minùs graui
ſpecie, quàm ſit ipſa aqua, tunc paries aqueus AG
nullo pacto ſuſtinebitur in eodem ſitu erectus, ſed
dilabetur ſſuetque è ſupremo loco A versùs infimum
F, neque oppoſitum vnquàm contingere poſſet, vt
ſcilicèt perſeuerante pariete aqueo AG erecto deſcen-
deret
infra libellam GH, & deinde motu reflexo
ſursùm perpendicularitèr aquæ infimam libellam FG
versùs IA propelleret perpendiculari motu, profe-
ctò hoc contigeret ſi inter aquam, & aerem adeſſet
paries ligneus, à quo impediretur effluuium aquæ in-
tra foueam AF; atnullo pariete interpoſito videtur
omninò impoſſibile vt aqua non defluat motu incli-
nato ad replendam cauitatem aeream AF.
Hocquę
confirmatur euidenti experientia; fiat burſa coria-
cea parallele pipeda ſursùm aperta ad inſtar putei,
& dilatatis quatuor eius angulis digitis, vel virgis,
immergatur burſa aere plena intra aquam; videbis,
quod nedùm baſis, & fundum, ſed etiam quatuor fa-
cies collaterales burſæ incuruantur conuexè versùs
intermedium axim eiuſdem putei, & ſi ſimùl digiti,
aut virgulæ educantur, nec ampliùs vim exerceant,
nedùm baſis, & fundum putei aſcendet ſursùm, ſed
etiam eius parietes collaterales ſe ſe conſtringent, &
ad ſe ſe inuicem accedent, quod eſt euidentiſſimum
ſignum, aquam nedùm vim facere ſursùm perpendi-
cularitèr aerem expellendo, ſed etiam lateralitèr

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