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

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1
Cap. 12. dę
vacui neceſ­
ſitate.
Cap. 12. dę
vacui neceſ­
ſitate.
PROP. CCLIII.
Iiſdem poſitis ſi præterea infimum syringæ orificium infra
mercurium in catino contentum mergatur, retracto em­
bolo mercurius aſcendet non ob vacui metum, ſcd impul­
ſus à pondere columnæ aquæ collateralis.
SI deinde in fundo putei RSTV ponatur catinum
MNO hydrargyro plenum, infra cuius libellam
MO orificium infimum C ſyrin­
182[Figure 182]
gæ immittatur, tunc paritèr re­
tracto embolo EFG mercurius
in ſyringa CD aſcendet, non qui­
dem ſponte ad replendum va­
cuum, ſed impulſus à maiori pon­
dere
columnæ aqueæ AB, & eò
vſque mercurij eleuatio perſe­
uerabit, quouſque fiat æquili­
brium inter momentum aquæ, &
mercurium, ſcilicèt ſi altitudo columnæ aqueæ AB
fuerit 18. cubitorum, oportet, vt altitudo æquè am­
plæ columnæ mercurij ſit cubitorum duorum, & ſe­
mis proximè, & hæc eſt ſumma altitudo ad quam̨
mercurius in prædicta syringa eleuari poteſt, at ſi vl­
terius vi manus embolum ſubleuetur, perſiſtet tamen
perſeuerabitque mercurius in priori illa altitudine,
& potius ſpatium exinanitum, ideſt abſque mercurio, &
abſque aqua, & aere relinquet, quàm mercurius pilum
fubleuetur.
& hinc nedum deducitur, quod mercurius
aſcendit quatenus, & quouſque impellitur ab oppo­
ſito pondere fluidi AB, ſed præterea conſtat, quòd non

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