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

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1
inuicem conantur recedere; quare ratione motus
aqua inferiùs, & poſticè recurrens non impellet oleum
ictum fugiens, nec proindè eius figuram AHC con­
tundere
, & explanare poteſt.
Igitur in hoc caſu duo
impetus inter ſe contrarij, & ab inuicem receden­
tes reperiuntur leuitatis olei, nimirùm, ſursùm ab H
versùs E, aquæ verò conatus inferiùs tendentis ab
H versùs I, igitur hæc duo corpora oleum AHCB,
& aqua ſubiecta MACK ſe mutuò tantummodò tan­
gent placidiſſimo amplexu abſque vlla pugna, & re­
pulſu, vt nimirùm aqua oleum non impellat, neque
hoc illam repellat, igitur oleum ABCH multò minùs
comprimi, ac contundi debetin H ab aqua ſubie­

cta deorsùm premente, quàm contundebatur poſticè
ab oleo incumbente, quando nimirum intra oleum̨
deſcendebat, & pondus eiuſdem olei incumbentis
patiebatur (in vtroque enim caſu recurſus fluidi ad
ſpatium replendum æquè reperitur, & proindè ne­
que nocet, neque adiuuat prædictum effectum) ſed
ex antepræmiſſa propoſitione aqua per oleum deci­
dens à vi natiua grauitatis impulſa retinet tumorem
eleuationemque conuexam in poſtica parte eius mo­
tus, igitur multò magis eleuari deberet tumor iņ
oleo per aquam aſcendente in parte poſteriore mo­
tus eius ſi ab intrinſeca leuitate eleuaretur, qua pro­
ptèr erit omninò impoſſibile, vt oleum, vel aer dum
aſcendit per aquam, excauetur in parte infima eius
baſis, quando nimirùm ſursùm fertur ab interno prin­
cipio leuitatis, quod demonſtrandum fuerat.

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