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

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1
Cap. 4. poſi­
tiuam leui­
tatem noņ
dari.
PROP. LVII.
Si Aer in aqua ſolummodò leuitatem exerceret, in ea non
aſcenderet à leuitate eius poſitiua impulſus.
ET primò ſupponamus prædicta elementa noņ
retinere ſimùl eodemque tempore duas oppo­
ſitas facultates grauitatis, & leuitatis, ſed ſucceſſi­
uè modò vnam, modò alteram poſſideant, prout in
diuerſis medijs fluidis collocantur, ſcilicèt aqua iņ
aere pendula ſolummodò grauis cenſeri debeat, non
autem leuis, ſi poſtmodum aqua infrà hydrargyrum
mergatur, tunc aqua leuis ſit, non autem grauis, po­
50[Figure 50]
natur etiam, quod aer, ſeù lignum
ſub aqua demerſum leue ſit, nec
grauitatem vllam habeat.
Con­
cipiatur poſtea vas RGHS a­
qua D plenum, & in eo merga­
tur maſſa aeris, vel ligni F, pa­
tet ergò ex ſupradicta hypo­
theſi, quod aqua D nullam leuitatem, ſed tantummo­
dò grauitatem habebit, eò quòd prædicta aqua non
ſupponitur demerſa intra aliud corpus fluidum den­
ſius, & ponderoſius ipſa, ſed contigua eſt aeri.
Mo­
dò quia aer, vel lignum F ſupponitur ab aduerſarijs
ſursùm aſcendere à G, versùs R impulſa à poſitiua
leuitate eius naturali, aqua verò circumfuſa D cona­
tum, atque impetum exercet deorsùm ab A versùs
H veluti natura eius grauitatis exigit, habebimus

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