Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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[171. Figure]
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retur
,
nullo
pacto
in
tali
caſu
poſſet
aqua
ab
inferiori
ſitu
H
ſursùm
impellere
aerem
G
,
propterea
quod
aqua
DB
cogitur
excurrere
deorsùm
per
vaſis
aper-
tum
foramen
B
, &
ideò
non
poteſt
motu
reflexo
ſur-
sùm
impellere
aerem
G
.
igitur
neceſsè
eſt
vt
globus
aereus
G
deferatur
à
vi
fluentis
aquæ
,
vt
ipſa
experi-
entia
oſtendit
.
Vnde
colligitur
,
quod
nullum
ex
ad-
ductis
, &
excogitatis
experimentis
vſque
adhuc
euin-
cere
perſuadereque
poteſt
exiſtentiam
leuitatis
po-
ſitiuæ, &
è
contrà
ſemper
multò
magis
confirmatur
,
demonſtraturque
eius
non
exiſtentia
,
quaproptèr
fa-
tendum
eſt
corpora
,
quæ
leuia
appellantur
,
ſursùm
impelli
per
extruſionem
à
fluidis
ambientibus
gra-
uioribus
.
Cap. 4. poſi-
tiuam
leui-
tatem
noņ
dari
.
Sed
coronidis
loco
afferam
demonſtrationem
à
me
excogitatam
,
abſolutè
non
dari
in
natura
poſitiuam
leuitatem
,
vtque
commodiùs
hoc
efficiam
primò
nonnullas
ſuppoſitiones
ſenſui
manifeſtas
proponam
,
&
deinceps
aliqua
lemmata
ex
principijs
mechani-
cis
deſumpta
demonſtrabo
.
DEFINITIO
I
.
ET
primò
noto
,
quòd
corpus
ſiue
ſimilare, & ho-
mogeneum,
ſiue
heterogeneum,
tunc
vocatur
exiſtimaturque
rarius
ſpecie
,
quàm
aliud
,
quando
ſumptis
æqualibus
molibus
eorumdem
illud
minorem
copiam
materialis
ſubſtantiæ
corporeæ
, &
ſenſibi-
lis
comprehendit
in
eodem
ſpatio
,
quàm
iſtud
,
quòd
profectò
concipi
poteſt
,
ſi
intelligatur
mino
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