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

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ris compresſionem ſenſui repugnare: cum inclinata fiſtula
derumeſcat veſica, antequam ſuperficies mercurij ad illam
perueniat.
Quarta, &
quinta ratio
eiuſdem au­
thoris.
Cap. 5. de ae
ris grauitate
æquilibrio,
ſtructura, &
vi elaterią
eius.
PROP. CVI.
Veſica cyprina inflata Roberuallij in ſummitate fiſtulæ Tor­
ricellianæ non ſemper detumeſcit poſt huius inclinatio­
nem, & ratio huius effectus redditur.
HOc profectò non ſemper accidit, præcipuè quan­
do fiſtula capacem ampullam in ſummitate ha­
bet, in ea enim commodè aliqua aeris portio, quæ sem­
per in fiſtulæ ſuprema parte remanet, aut ibidem col­
ligitur reduciturque poſtquàm ſegregatur à mercu­
rij ſubſtantia, per quam aſcendunt innumera granula
aerea partim viſibilia, partim inconſpicua ob minu­
tiem, & hæc quidem ad ſupremam mercurij ſuperfi­
ciem aſcendunt, & prout magis ad ſpatium vacuum
appropinquantur, eo magis creſcunt bullæ aereæ, in­
fianturque, & tandem expanduntur, diſſiliunt rumpun­
turque in prædicto ſpatio vacuo, & hoc magis euiden­
ter obſeruatur ſi ſuprema hydrargyri cylindri ſuper­
ficies exigua aquæ portione cooperiatur, tunc gra­
nula aerea à mercurio aſcendentia videri poſſunt in
tranſitu per aquam tranſpicuam, quæ ſpeciem repre­
ſentant ebullitionis cuiuſdam compoſitæ ex prædi­
ctis particulis aereis inflatis, & velociſſimè ſursum ex­
currentibus. His poſitis veſicula illa cyprina Rober­
uallij inclinata fiſtula ſolet detumeſcere antequam̨

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