Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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motus
,
nam
poſtquam
leuius
corpus
B
ad
æquabili-
tatem
redigitur
,
continuatur
adhuc
incrementum
im-
petus
in
grauiori
ſolido
A
;
totum
ergo
id
,
quod
au-
getur
gradus
impetus
ipſius
A
creat
notabilem
ex-
ceſſum
ſupra
illum
gradum
debilem
corporis
B
eodem
,
&
vniformi
gradu
impetus
excurrentis
,
quare
neceſ-
sè
eſt
,
vt
propè
initium
motus
parùm
differant
velo-
citates
grauium
A
, &
B
,
ſcilicèt
fiant
ſecundùm
pro-
portiones
ſuperiùs
expoſitas
, &
poſtea
in
progreſſu
motus
multò
magis
inter
ſe
differant
.
quod
profectò
euincitur ex
eo
,
quòd
ſi
prædicta
inſignis
inæqualitas
velocitatum
,
quę
in
progreſſu
motuum
eorum
obſer-
uatur
,
eſſet
propria
, &
naturalis
horum
corporum
sem-
per
in
eodem
fluido
in
eadem
proportione
fieri
de-
beret
,
ſcilicèt
in
quibuslibet
temporibus
æqualibus
moueri
deberent
proportionalibus
velocitatibus
, &
ſic
medulla
ſambuci
v
.
g
.
quæ
in
decem
minutis
ſecun-
dis
horarijs
pertranſit
ſemiſſem
itineris
exacti
à
pila
marmorea
,
vt
refert
Merſennus,
etiam
in
vno
minuto
ſecundo
illa
medietatem
ſpatij
huius
pertranſiret
,
quod
euidentèr
falſum
eſt
.
Pro
. 243. &
244.
Pro
. 245.
Cap. 11.
gra-
uia
in
fluido
velocitati-
bus
inæqua-
libus
ferri
debere
.
Prop. 241.
& 243.
Reſponde-
tur
experi-
mento
Mer­
ſeni
, &
alio-
rum
.
Hinc
reſoluere
poſſumus
difficultatem
ab
experi-
méto Merſenni
deſumptam
;
is
enim
ſumpſit
duas
pi-
las
æquales
,
vnam
plumbeam
,
alteram
argillaceam
,
&
in
profunditate
trium
pedum
aquæ
inſumpſit
plum-
bum
vnum
minutum
ſecundum
,
argillacea
verò
quin-
que
minuta
ſecunda
,
noſter
verò
calculus
minorem̨
inæ
qualitatem
efficit
,
dum
enim
pila
plumbea
deſcen-
dit
ſpatium
aliquod
in
vno
minuto
ſecundo
,
argilla-
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