Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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Cap. 4. poſi-
tiuam
leui-
tatem
noņ
dari
.
Cap. 4. poſi-
tiuam
leui-
tatem
noņ
dari
.
PROP. LXIX.
Flammæ
candelæ
vertex
acuminatur
,
quia
magis
accen-
ſus
, &
ideò
velociùs
aſcendit
,
quàm
baſis
eius
.
PRæterea
ſupponendum
eſt
,
flammam
candelæ
non
habere
conſiſtentiam homogeneam, & ſimila-
rem,
pars
enim
infima
flammulæ
non
eſt
omninò
ac-
cenſa
,
quod
conſtat
ex
eius
colore
ſubliuido,
quia
nimirùm
fumi
oleoſi
eructati
ab
elicnio,
vel
ligno
non
in
inſtanti
,
ſed
in
tempore
accendi
debent
,
igitur
veri-
ſimile
eſt
,
quòd
non
omnes
prędicti
fumi
ſubitò
poſt
e-
greſſum
in
ipſo
contactu
baſis
flammæ
ſimùl
, &
inte-
grè
accendantur
, &
propterea
rarefactio, & accen-
ſio
continuatur
dùm
actu
excurrunt
illæ
particulæ
à
baſi
versùs
verticem
flammæ
.
Modò
ſi
in
baſi
flam-
mulæ
fumi
non
ſunt
omninò
, &
integrè
accenſi
,
non
habebunt
velociſſimum
illum
motum
,
cuius
capax
eſt
flammæ
puræ
natura
,
igitur
in
ipſa
flamma
conci-
pi
debet
pars
infima
tardior
,
quàm
ſuprema
, & ver-
ticalis,
ſed
ſicuti
in
fluuio
nulla
alia
de
cauſa
tantą
copia
aquæ
in
anguſtiſſimum
ſpatium
aluei
reſtrin-
gitur
coanguſtaturque
,
niſi
quia
velociſſimè
excur-
rit
,
cùm
è
contrà
in
locis
dilatatis
, &
amplis
eadem
aquæ
fluminis
moles
amplius
ſpatium
aluei
ob
eius
tarditatem
occupet
,
ita
in
flamma
lucernæ
,
quæ
vt
fluuius
ignis
excurrentis
concipi
poteſt
,
mirum
non
eſt
,
quòd
in
baſi
propè
elicnium
ob
tarditatem
eius
fluxus
ampliorem
ſitum
occupet
,
quàm
in
eius
ver-
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