Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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Cap. 4. poſi-
tiuam
leui-
tatem
noņ
dari
.
In
prop. 74.
Cap. 4. poſi-
tiuam
leui-
tatem
noņ
dari
.
His
præmiſſis
examinari
modò
debent
ſigillatim̨
oppoſitiones
ſuperiùs
adductæ
.
PROP. LXXVII.
Et
primo
loco
dieo,
quòd
figura
inflata
, conuexa, &
acumi-
nata
quam
aer
acquirit
in
fiſtula
aqua
plena
in
parte
an-
teriori
eius
motus
dum
ſursùm
aſcendit
,
non
eſt
argu-
mentum
efficax
, & euincens
aerem
ſursùm
moueri
à
principio
intrinſeco
ſuæ
leuitatis
.
QVia
demonſtratum
eſt
corpora
fluida
cedentia
,
& homogenea
ſi
moueantur
intra
aliud
cor-
pus
Huidum
ſiue
propria
, &
intrinſeca
virtute
moti-
ua,
ſiue
ab
impulſu
facto
à
cauſa
extrinſeca
,
aut
ab
ipſo
medio
,
neceſſariò
in
anteriori
parte
motus
il-
lius
tume
fieri
, contornari, &
aliquantiſper
acumina-
ri
debere
,
quaproptèr
tumor
,
qui
in
aere
aſcenden-
te
per
aquam
obſeruatur
,
neque
iuuat,
neque
nocet
,
nec
ſuadet
,
neque
diſſuadet
leuitatem
poſitiuam̨.
Mirum
tamen
eſt
non
animaduerſam
fuiſſe
cauſam
cauitatis
eiuſdem
aeris
in
parte
poſtica
eius
motus
,
à
qua
cauitate,
ſicut
oſtenſum
eſt
,
euidentèr
deduci-
tur
impoſſibile
eſſe
aerem
ab
intrinſeco
principio
le-
uitatis
ſursùm
ferri
,
ſed
potiùs
per
extruſionem
me-
dij
fluidi
ſursùm
eleuari
.
Prop. 72.
Cùm
poſtea
inſtat
aduerſarius
aerem
,
dum
per
a-
quam
aſcendit
,
acumen
eius
ſursùm
porrigere
,
vt
fa-
ciliùs
terebrare, &
perforare
aquam
vi
ſuæ
leuitatis
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