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

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1
34[Figure 34]
dem verificetur, dum aqua
in prædicto vaſe contenta
prorsùs quieſcit, ſaltèm̨
quoad ſenſus apparentiam,
ſi poſtea aqua agitetur, vt
nimirùm pars EF deſcen­
dat verſus vaſis fundum, reliqua verò pars FG, ſur­
sùm aſcendat motu quodam vertiginoſo, fi verum̨
eſt, quòd motus aſcenſiuus ipſius aquæ indicat de­
fectum grauitatis eius, tunc perſeuerante dicto mo­
tu aſcenſus minui deberet pondus totius vaſis AC,
& propterea libra HL non quieſceret, ſed deprime­
retur pondus R, quod tamen repugnat ſenſus eui­
dentiæ; non igitur ex eo quòd aqua mouetur in ali­
quo vaſe carebit propria, & natiua grauitate, ſicuti
homo aſcendens per ſcalam extremo termino libræ
alligatam æquali momento libram premeret, ac ſi
idem homo in ſcala quieſceret, quia nimirùm dum
aſcendit non minus ſuſtentatur quàm dum quieſcit.
Cap. 3. flui­
dum in ſuo
toto quie­
ſcens pon­
derat.
Sed dices, cum motus vertiginoſus aquæ fieri non
poſſit abſque eo quod vna pars deſcendat, & reli­
qua ſubleuetur, eſt valdè probabile, vt ſicut aſcenſus
aquæ FG indicat defectum grauitatis, cùm prædi­
ctus motus ſupponat impetum à quo ſursùm propel­
latur ſicuti ſaxum quod ſursùm proijcitur in actu ſui
aſcenſus, neque graue dici poteſt, nec grauitatem
exercet, proptereà quòd ab impetu impreſſo con­
trario grauitati, vel ipſamet grauitas deſtruitur, vel
impeditur, & ceſſat eius operatio.
Oppoſitum con-

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