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

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1
tiam
corpoream, & plenam, vt nimirum maius
ſpatium
occupet, & in hoc caſu comparari debent
ſpatia
occupata, ſiuè moles æquales inter ſe, & cum
medio
fluido in quo leuitant, vt ſi fuerint duæ pilæ
æquales
, vna aquea, altera aerea intra mercurium de­
merſę
, dicetur maior leuitas intenſiuè aeris reſpectu
leuitatis
aquæ, & leuitates eamdem proportionem
habebunt
, quàm raritates molium æquallum aeris,

& aquę in mercurio conſideratæ habent.
Et hoc eui­
dentia
ſenſus ſuadet, ſi enim intra hydrargyrum de­
mergatur
ampulla vitrea plumbo repleta, huius qui­
dem
gradus leuitatis menſuratur à vi contraria, quæ
aſcenſum
eius in mercurio prohibere poteſt, ſitque
talis
vis contraria pondus duarum vnciarum ſuper­
poſitum
, & intra mercutium fixè detinens natantem
ampullam
.
Si poſtea plumbi vncia è cauitate ampul­
ſubtrahatur, patet quod tantum præcisè totius am­
pullæ
raritas aucta erit, quantum diminuta fuit ſub­
ſtantia
corporea ponderoſa intra ampullam eiuſdem
molis
, & figuræ contenta, & tunc gradus leuitatis
præcisè
augebitur vna vncia, nam ſi velimus aſcensum
eiuſdem
ampullæ prohibere ſuperponi debent non
duæ
vt priùs, ſed tres vnciæ, poſtea ſi ampullæ rari­
tas
denuò augeatur detracta altera plumbi vncia, gra­
dus
quoque leuitatis eadem menſura creſcet vt ni­
mirùm
requirantur quatuor vnciæ ad prohibendum
eius
aſcenſum è mercurio, idemque verificatur ſi
vlterius
pondus internum ampullæ diminuatur; qua­
re
incrementa leuitatis proportionalia ſunt incre-

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