Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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ctu,
aquæ
;
ſi
enim
ſumantur
tres
moles
æquales
auri
,
ſtanni
, &
aquæ
,
qualium
partium
pondus
auri
fuerit
100.
pondus
ſtanni
erit
39
proximè
, &
pondus
aquæ
erit
5.
cum
triente
.
Verùm
, ex
noſtra
inuentione
iņ
Academia
Experimentali Medicea explorauimus
proportionem
ponderis
ſpecifici
aquæ
ad
aerem
,
quæ
fuit
vt
1175
ad
1
proximè
,
igitur
qualium
partium
alicuius
ſphęræ
aeris
pondus
eſt
vnius
grani
,
erit
pon-
dus
pilæ
aqueæ
eiuſdem
molis
1175
granorum
,
qua-
re
pila
ſtannea
eiuſdem
menſuræ
erit
8592
granorum
,
at
que
pila
aurea
eiuſdem
diametri
erit
21406
gra-
norum
.
His
poſitis
facto
calculo
,
vt
antepræmiſſą
propoſitio
perſcribit
,
reperitur
proportio
velocitatum
auri
, &
ſtanni
in
aqua
vt
10
ad
9
proximè
;
ſed
in
ae-
re
ſi
velocitas
auri
fuerit
21405
erit
velocitas
ſtanni
21404
ferè
; &
hinc
patet
quare
in
aere
corpora
inę-
qualiter
grauia
vt
aurum
, &
ſtannum
vniformi
, &
æ-
quali
ferè
velocitate
deſcendunt
,
in
aqua
verò
inſi-
gni
exceſſu
velocitas
auri
ſuperat
ſtanni
celeritatem
in
deſcenſu
.
Cap. 11.
gra-
uia
in
fluido
velocitati-
bus
inæqua-
libus
ferri
debere
.
Sed
hìc
ſummoperè
animaduertendum
eſt
,
quod
ſuperiùs
expoſita
theoria
verificatur
in
paruis
altitu-
dinibus
, &
in
principijs
deſcenſuum
,
non
verò
iņ
prolixiori
motu
,
propterea
quod
,
vt
mox
declarabi-
mus
,
ab
alia
noua
cauſa
valdè
alterantur
prædictæ
proportiones
velocitatum
grauium
deſcendentium
,
pro
cuius
intelligentia
præmittuntur
hæc
.
PROP. CCXLIV.
Motus
deſcenſus
cuiuslibet
grauis
in
fluido
ſuccesſiuè
retar-
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