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

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1
mit eius fundum, non verò ſuperficiem ſtagnantis mer­
curij C, & ſic mercurius comprimitur tantummodò à
cylindro oleoſo GC.
Cap. 5. de ae­
ris grauitate
æquilibrio,
ſtructura, &
vi elaterią
eius.
Cap. 5. de ae­
ris grauitate
æquilibrio,
ſtructura, &
vi elaterią
eius.
PROP. CXV.
Mercurius in fiſtula Torricellian a altiùs eleuabitur dum aer
nebulis pluuioſis impregnatur, at postquam pluuia
delapſa eſt, denuò mercurius in fistulæ
deprimitur.
AB hoc euidentiſſimo experimento problema no­
ſtrum ſolui poſſe cenſeo, quandoquidem quid
aliud ſunt nebulæ pluuioſæ, ſcilicèt aqua grauidæ,
quàm aggregatum ex innumeris granulis minutiſſi­
mis aqueis?
& cùm prædicta nebula in altiſſimis ae­
ris partibus innatat, vellentiſſimo
97[Figure 97]
motu aquæ particulæ eius deſcen­
dunt
, procùl dubio ſuo pondere na­
turali augent aeris grauitatem, ideo­
que maiori niſu globum terraqueum
comprimunt, quam aer purus, &
aqueis guttulis omninò priuatus
conſtringere eum poſſit: & ideò fi­
ſtula mercurialis ABC in infimo
prædicto aere conſtituta compri­
mitur nedùm à pondere ſuperſtan­
tis aeris, ſed præterea à ponderę
totius aquæ nebulam ſupremam̨
componentis: itaque per aliquod tempus antequam

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