Borelli, Giovanni Alfonso - De motionibus naturalibus a gravitate pendentibus

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

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Cap. 5. de ae-
ris grauitate
æquilibrio,
ſtructura, &
vi elaterią
eius.

PROP. CXVII.

Secunda Merſenni experientia in ſclopeto pneumatico
fact a dubia quoque eſt.

MElior eſt ſecunda Merſenni experientia dùm̨
in bombarda, ſeu ſclopeto pneumatico ma-
gno conatu immiſit vaſtam aeris molem, quæ in exi-
guo ſpatio condenſata fuit, aitque pondus ſexagin-
ta granorum aeris incluſiſſe in cauitate catapultæ, quæ
ab 8. vncijs aquæ impleri poterat, hinc deducit ae-
rem in ſclopeto immiſſum adeò condenſari vt quin-
decies ſpatium internum catapultæ expleat; proin-
de que tres digitos cubicos aeris ferè ponderare gra-
num vnum. Sed ex tanto apparatu tandem Merſen-
nus nil certi colligit, cùm afferat innumeras difficul-
tates, & ingenuè fateatur, ſemper dubitari poſſe an
intra catapultæ cauitatem vnà cum aere inſuffletur
particula aliqua oleaginoſa, vel aquea, quandoqui-
dem epiſtomium emboli humectari debetin eius ſu-
perficie coriacea, vt omninò rimæ claudantur, vt re-
greſſus aeris prohibeatur.

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