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

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1
tionem, quæ in libero aere efficiebatur, ſit pars de­
cimaquarta altitudinis aquæ ND. in hoc rerum ſta­
tu digito, vel quolibet alio operculo claudatur fi­
ſtulæ oſtium G hic iam ceſſat om­
92[Figure 92]
ninò actio, & compreſſio ponderis
cylindri aquei NG, & tamen mer­
curius in eodem ſigno fiſtulæ H
perſeuerat, igitur eodem modo
in aere occluſo oſtio G perſeue­
rare, & retineri debet mercurius
ſubleuatus vſque ad F mediatè qui­
dem
à pondere aeris qui prius incum­
bebat
, ſed modo immediatè ab illa compreſſione, &
reſtrictione, quam produxerat pondus incumbentis
aeris SG. vnde conſtat quod mercurius in fiſtula ele­
uari poteſt à pondere aeris ambientis, nec adductą
difficultas hanc ſententiam debilitat aut deſtruit.
Cap. 5. de ae
ris grauitate
æquilibrio,
ſtructura, &
vi elaterią
eius.
Subdit poſtea pro confirmatione ſui ratiocinij:

Iam verò facilè ostendo non ſustineri, ſeu ſuſpendi in BF eò
quod aer interceptus inter operculum, & ſuperficiem vlte­
riori compreſsioni reſistat, nempè ſi admoto dicto operculo, &
extante mercurio in BF aperiatur foramen in A mercurius
illicò infra F deſcendit, idque notabili ſegmento, &c.
Hoc ratio­
cinium cona
tur refellere
aduerſarius.
Sibi ipſi poſtea opponit dicendo, quòd mercurius
deorsum impellitur duplici vi, propriæ ſcilicèt grauita­
tis mercurij BF, & ponderis aeris per ſupremum foramen
fluentis, quid mirum ſi præualeat, interceptumque ae­
rem vlteriùs comprimat, & mercurium infra F depri­
mat.
poſtea huic argumento reſpondet: Dico non ma-

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