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

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1
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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