Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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perforauimus
fundum
vaſis
IH,
vt
nimirùm
è
partę
ſubiecta
aer
ſuccedere
poſſet
ad
replendum
vacuum
,
&
ſic
leuitas
poſitiua
ligni
G
abſque
vacui
periculo
commodè
ſursùm
aſcendere
poſſet
;
hac
præparatione
facta
,
illa
lignea
pila
fundum
non
dereliquit
,
nec
ſur-
sùm
aſcendit
;
nec
paritèr
aſcendit
poſtquam
foramen
H
occluſum
denuò
fuit
, & cauitas
ſubiecta
EIF, &
ſuprema
AED
repleta
hydrargyro
fuit
.
Vnde
dedu-
cere
poſſumus
pilam
non
à
poſitiua
leuitate
eleuari
,
ſed
potiùs
ab
expreſſione
ambientis
fluidi
quotieſ-
cumque
excurrere
poteſt
abſque
impedimento
in-
fra
ſuperficiem
eiuſdem
pilæ
.
Cap. 4. poſi-
tiuam
leui-
tatem
noņ
dari
.
Perpendamus
tandem
poſtrema
verba
eiuſdem̨
Authoris
,
qui
ait
:
Sed
quid
dicent
aduerſarij
,
ſi
in
fundo
vaſis
eſſet
foramen
amplum
,
anguſtius
tamen
cylindro
, &
occluſum
,
quod
eodem
momento
aperiretur
quo
manus
eleuat
virgam
?
certè
enim
aqua
efflueret
deorsùm
, &
tamen
cy-
lindraceum
lignum
illud
tenderet
ſursùm
.
Agnoſcant
ergò
in
ligno
illo
leuitatem
aliquam
,
quæ
impetum
producendo
ſursùm
versùs
priùs
natura
mouet
,
ac
pellit
aquam
, &
cau-
ſaest
vt
aqua
corpus
fluidum
it
a
illi
cedat
,
vt
ſubintret
in
illius
locum
,
ne
detur
vacuum
,
eamque
non
exercere
gra-
uitatem
actu
,
ſed
ſuperiores
quidem
aquæ
partes
impelli
à
cylindro
ligneo
, &
cedere
illi
locum
digrediendo
ad
latera
,
vt
locum
illarum
partium
impleant
,
quæ
infernè
ſubintrant
in
locum
cylindri
.
Et
hic
nil
aliud
reſpondere
poſſum̨
niſi
mirari
confidentiam,
ſecuritatemque
qua
aſſeri-
tur
experientia
non
ſicuti
reuera
ſe
habet
,
vtque
à
quolibet
comprobari
poteſt
,
ſed
veluti
præiudica-
ta
opinio
eis
perſuaſerat
.
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