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

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1
bet, & quia hoc ſemper repetitur, ſcilicèt perpetuò
reſtituitur in ſuperiori loco AI aqua duplò grauior,
quàm ea, quæ in loco infimo HD reponitur, igitur
vt contingit in libra efficientur perpetuæ, & conti­
nuatæ vibrationes, veluti in pendulo, & in aqua fie­
ri ſolent plures vndulationes, ſic in aqua perpetuo
motu agitarentur eius partes aſcendendo, & deſcen­
dendo.
hoc verò ſenſus euidentia redarguit, igitur
fatendum eſt ſupremam aquam AI ſuſtentatam ab
inferiori aqua ſuper eam non exercere vim vllam̨,
nec preſſionem, proinde que non grauitare, hac ſcili­
cet de cauſa, quia nimirùm in eius loco naturali col­
locata re quieſcit, ac ſiſtitur.
Contra do­
ctrinam ſu­
periùs addu­
ctam adeſt
noua difficul­
tas, quod ni­
mirum mo­
tu perpetuo
aqua agitari
deberet.
Cap. 3. flui­
dum in ſuo
toto quie­
ſcens ponde­
rat.
PROP. XVIII.
Maior aquæ moles alteri ſupe poſita non exercet maiorem
vim compresſiuam, quàm minor.
VT verò huiuſmodi paralogiſmus detegatur,
nimaduertendum
eſt minimè verum eſſe, quòd
quælibet aquæ moles maior alterà, nempe dupla, exer­
ceat quoque duplam vim grauitantem quotieſcum­
que maior ſupra minorem inſiſtat, & ab ea fulciatur,
ſed tunc ſolummodò propoſitio verificatur quando
earum baſes contiguæ æquales fuerint, ac inſuper in
eodem plano horizonti parallelo conſtiterint.
Sup­
ponatur vas cylindricum plenum aqua ABDC, ſit­
que portio ſuprema, & ideò eius altitudo AH dupla
infimæ altitudinis HB, licèt ergo reuerà ſupremæ

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