Archimedes
,
Archimedis De iis qvae vehvntvr in aqva libri dvo
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FED. COMMANDINI
tionem
cadet
:
Itaque
cum
à
portione
conoidis,
cuius
gra-
uitatis
centrum
e
auferatur
inſcripta
figura
,
centrum
ha-
bens
p
:
&
ſit
l
e
ad
e
p
,
ut
figura
inſcripta
ad
portiones
reli
quas
:
erit
magnitudinis
,
quæ
ex
reliquis
portionibus
con
ſtat
,
centrum
grauitatis
punctum
l
,
extra
portionem
ca-
dens
.
quod
fieri
nequit
.
ergo
linea
p
e
minor
eſt
ip ſa
g
li-
nea
propoſita
.
Ex
quibus
perſpicuum
eſt
centrum
grauitatis
figuræ
inſcriptæ
, &
circumſcriptæ
eo
magis
acce
dere
ad
portionis
centrum
,
quo
pluribus
cylin-
dris,
uel
cylindri
portionibus
conſtet
:
fiatq́ figu
ra
inſcripta
maior
, &
circumſcripta
minor
.
&
quanquam
continenter
ad
portionis
centrū
pro-
pius
admoueatur
nunquam
tamen
ad
ipſum
per
ueniet
.
ſequeretur
enim
figuram
inſcriptam
, nó
ſolum
portioni
,
ſed
etiam
circumſcriptæ
figuræ
æqualem
eſſe
.
quod
eſt
abſurdum
.
THE
OREMA XXIII.
PROPOSITIO
XXIX.
Cvivslibet
portionis
conoidis rectangu-
li
axis
à
cẽtro
grauitatis
ita
diuiditur
,
ut
pars
quæ
terminatur
ad
uerticem
,
reliquæ
partis
,
quæ
ad
ba
ſim
ſit
dupla
.
SIT
portio
conoidis rectanguli
uel
abſciſſa
plano
ad
axem
recto
,
uel
non
recto
:
&
ſecta
ipſa
altero
plano
per
axé
ſit
ſuperſiciei
ſe
ctio
a
b
c
r
ectanguli
coni
ſectio
,
uel
parabo
le;
plani
abſcindentis
portionem
ſectio
ſit
recta
linea
a
c
:
axis
portionis
, &
ſectionis
diameter
b
d
.
Sumatur
autem
in
linea
b
d
punctum
e
,
ita
ut
b
e
ſit
ipſius
e
d
dupla
.
Dico
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