Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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ſatur
,
conſtipaturque
, &
primum
vocatur
augmen-
tum
grauitatis
extenſiuum,
reliquum
verò
intenſiuum
.
Regula
verò
,
qua
menſurari
poteſt
gradus
prædictæ
grauitatis
commodè
deſumitur
à
vi
contraria
,
quæ
depreſſionem
eius
prohibere
poteſt
, & hic
notandum
eſt
minimè
nos
ſollicitos
eſſe
de
velocitate
motus
,
qua
deorsùm
eadem
grauia
feruntur
,
ſed
tantummo-
dò
conſiderare
vim
, &
conatum
ponderis
eius
,
qui
in
libra
à
vi
oppoſiti
æquipondij
præcisè
menſuratur
.
Vis
compri-
mens
exten-
ſiuè
augetur
multiplicata
mole
corpo-
ris
.
Intenſiuè
ve-
rò
conſtipa
ta, &
conden
ſata
mate-
ria
.
Cap. 4. poſi-
tiuam
leui-
tatem
noņ
dari
.
Gradus
præ-
dictæ
graui-
tatis
menſu-
ratur
à
vi
con-
traria
,
quæ
depreſſionem
eius
prohi-
bere
poteſt
.
Hic no
agi-
tur
de
velo-
citate
deſcen-
ſus
,
ſed
de
vi
compreſſiua
.
SVPPOSITIO
IX.
Vis
ſursùm
impellens
quę
leuitas
voca-
tur
augeri
po
teſt
extenſi-
uè
multipli-
cato
eodem
corpore
le-
ui
.
NOn
ſecùs
quando
agitur
de
vi
, &
energia
, quą
corpora
,
quæ
leuia
appellantur
ſursùm
moue-
ri
nituntur
,
quæritur
non
velocitas
,
ſed
vis
,
quæ
ſursùm
impellit
,
quæ
leuitas
appellari
ſolet
, &
hæc
quoque
duplici
modo
augeri
poteſt
,
aut
extenſiuè
,
aut
intenſiuè
,
ſcilicèt
aut
multiplicando
molem
eiuſdem
corporis
leuis
,
vt
ſphæra
aeris
palmaris
octies
maio-
rem
leuitatem
habebit
,
quam
ſphæra
eiuſdem
aeris
ſemipal-
maris,
propterea
quod
vis
illa
leuitatis
tantumdem
multiplicatur
,
quantum
maſſa
eius
corporea
exten-
ditur
,
cùm
omnes
partes
eiuſdem
aeris
æquè
leues
ſint
, &
æquè
raræ
,
requiraturque
vis
contraria
pro-
hibens
illius
aſcenſum
octiès
maior
quam
in
huius
aeris
minori
mole
requiratur
.
Secundo
modo
auge
ri
poteſt
leuitas
expandendo
, &
rarefaciendo
ſubſtan-
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