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

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1
uerſario
, quòd fiſtula AC nil prorsùs ab incluſo mer­
curio
BC grauatur, & ſic de facto experimur appli­
cata
digiti pulpa ori infimo fiſtulæ; quod in partę
intermedia
pulpæ à mercurio tacta nulla compreſſio,
nec
contuſio neque grauitatio perſentitur, quando præ­
cisè
mercurij altitudo BC eſt vnius cubiti, & qua­
drantis
ferè; quod ſieius altitudo ſupra CB augeatur,
tunc ſolummodò percipitur in medio pulpæ digiti ſub­
iecti
compreſſio grauitans iuxtà menſuram exceſſus mer­
curij
ſupra eum qui altitudinem vnius cubiti, & qua­
drantis
occupat, & ſi è contrà mercurius deprima­
tur
violentèr infra debitam altitudinem BC, tunc ne­
dùm
ſubiecta pulpa digiti non comprimitur, ſed è
contrà
exugitur, vt efficiunt cucurbitæ medicæ, &
hyrudines
.
Sed dicet aduerſarius ſi mercurius BC
nil
grauitat, nec comprimit digitum, quare requi­
ritur
vis, aut libræ, aut digiti ſubiecti, quæ nedum̨
æquet
pondus ſolias vitri AC, ſed prætereà ſuſtine­
re
valeat duas libras v. g. quas pendit mercurius BC?
Reſpondeo aereum cylindrum SA fiſtulæ vitreæ in­
cumbentem
ſua grauitate agere non minùs, quàm̨
collateralis
cylindrus aereus SG, cumque vitrum̨
CA
non repellatur æquali actione contraria ſursùm
ab
aere collaterali SG, quia huius vis exercetur, &
omninò
expletur ſuſtentando mercurium BC; igitur
neceſſariò
vitrum CA comprimitur deorsùm à gra­
uitate
aeris incumbentis SA, cuius pondus æqualę
eſt
mercurio BC hinc fit vi ex præconcepta falſa opi­
nione
tribuamus compreſſionem aeris SA nobis in-

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