Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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Cap. 7. dę
natura
flui-
ditatis.
SI
modò
philoſophari
velimus
non
iuxtà
homi-
num
placita
,
ſed
ſecundùm
naturæ
leges
,
quatuor
conditiones
neceſſariæ
eſſe
videntur
ad
fluidi
conſti-
tutionem
.
Primùm
vt
ſit
corpus
diuiſum
, &
ſub
diui-
ſum
in
exiguas
, &
minimas
particulas
.
Secundò
vt
eius
figuræ
ad
orbicularem
formam
quam
proximè
accedant
.
Tertiò
vt
harum
ſuperficies
,
vel
ſint
per-
fectiſſimè
lęuigatæ
ad
modum
ſpeculi
,
vel
ſaltem
facilli-
mè
vna
ſuper
alteram
excurrere
, &
fluere
poſſit
.
Et
tandem
oportet
vt
omnes
habeant
æqualem
vim
motiuam
qua
deorsùm
tendant
,
ſcilicèt
ſint
æquè
graues
;
Poſſent
hæc
omnia
(
licèt
rudi
exemplo
)
non
ineptè
confir-
mari
ſumptis
pluribus
globulis
cryſtallinis
,
poſitiſque
in
aliquo
vaſe
,
primò
prædicti
globuli
ad
ſigaram̨
vaſis
adaptantur
, &
ſi
manus
vſque
ad
fundum
vaſis
immittatur
,
tunc
globuli
prædicti
locum
cedunt
, &
ad
latera
excurrunt
,
præterea
poterit
moueri
vna
,
vel
al-
tera
pila
cryſtallina
,
quieſcentibus
pilis
collaterali-
bus,
vel
parum
motis
;
inſuper
poſt
agitationem
ex-
planarentur
prædicti
globuli
,
non
enim
aceruum
,
aut
montem
efficerent
,
veluti
grana
frumenti
,
aut
arenæ
,
ſed
ob
eorum
læuitatem
facilè
excurrerent
deſcende-
rentque
versùs
infima
loca
, &
ſic
ſuprema
ſuperficies
explanaretur
, &
proximè
horizonti æquidiſtantèr
diſponeretur
.
Si
poſtea
prædictæ
ſphærulæ
cryſtalli-
næ
magis
exiguæ
, &
minutæ
eſſent
,
tunc
multò
faci-
liùs
prædictæ
operationes
efficerentur
, &
ſi
tandèm
ad
ineffabilem
paruitatem
redigerentur
,
non
poſſent
neque
tactu
neque
viſu
percipi
,
ſed
apparentem
con-
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