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

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1
nuò
duplici veſica ſuilla ſtrictè alligata claudatur
orificium
F.
Poſteà præparari debet vas profundum
PQR
aqua plenum vſque ad ſummitatem PR, ſitque
eius
profunditas tanta vt mergi poſſit vniuerſum in­
ſtrumentum
MAC, vt tamen eius baſis C putei fun­
dum
non attingat; demergatur fiſtula prædicta vitrea
vnà
cum mercurio contento intra aquam; & ſi fortè
os
ſupremum vitri M non demergitur infra aquæ ſu­
perficiem
PR, exigui anuli ænei totidem vnciæ gra­
na
pendentes in C, & in ſummitate A apponantur,
quouſque
vniuerſa machina vitrea fiat proximè mi­
nùs
grauis ſpecie quàm aqua, ſcilicèt innatet, & emi­
neat
ſupra aquę libellam PR pars aliqua SN prædi­
cti
fili ænei vitro annexi, & in S fiat æquilibrium, &
quies
.
Deinde in aere aperiatur ſupremum os vitri
M
, vt ſpatium inane ABL aere impleatur, remane­
bitque
reliqua pars fiſtulæ plena hydrargyro, vt priùs,
propterea
quod operculum in F impedit exitum mer­
curio
LCF.
In hoc ſtatu denuò eadem ſuilla veſicą
claudatur
arcteque ligetur vitri os ſupremum M; &
tandem
denuò demergatur fiſtula infra libellam aquæ
PR
.
Et quia in hoc caſu demergitur infra aquæ libel­
lam
moles conflata ex ijſdem corporibus, ſcilicèt ex
vitro
ACF, ex hydrargyro LCF, & ex ijſdem veſicis,
& filis M & F, & ſolummodò de nouo adeſt aer ABL,
quo
fiſtula priùs care bat; igitur neceſsè eſt, vt pondus
totius
machinæ NACF maius ſit quàm in priori ſta­
tu
quando ſpatium ABL vacuum fuerat.
Quaproptèr
non
poterit denuò ſubleuari fiſtula ad eamdem alti-

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