Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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Cap. 5.
de
ae-
ris
grauitate
æquilibrio
,
ſtructura
, &
vi
elaterią
eius
.
Cap. 5.
de
ae-
ris
grauitate
æquilibrio
,
ſtructura
, &
vi
elaterią
eius
.
Si
poſtea
fiſtula
vitrea
ſecetur
in
B
,
eiuſque
ſupre-
ma
portio
BA
tollatur
amoueaturque,
at
que
pondus
M
æquale
ſit
grauitati
vitri
decurtati
CB,
tunc
quidem
incumbit
,
ac
innititur
fiſtulę
cylindrus
aqueus BA
fiſtulamque
comprimit
non
ſecus
,
ac
priùs
quando
intra
cauitatem
fiſtulæ
AB
continebatur
.
PROP. CIII.
Licèt
Torricelliana
fistula
à
mercurio
in
ea
ſuſpenſo
non
gra-
uetur
,
tamen
manus
cogitur
ſuſtinere
pondus
cylin-
dri
aerei
fiſtulæ
incumbentis
,
quod
æquatur
pon-
deri
incluſi
mercurij
.
IDipſum
noſtræ
fiſtulæ
directæ
in
ae-
re
conſtitutæ
adaptari
poteſt
,
ſit-
que
illa
AC
duorum
cubitorum
habe-
atque
orificium
C
inſignis
exiguitatis
,
repleaturque
mercurio
deorſumquę
inuertatur
in
aere
libero
(
non
enim
neceſsè
eſt
,
vt
os
C
intra
ſcutellam
mercurij
plenam
infundatur
,
quando
valdè
ſtrictum
eſt
os
eius
C
,)
tunc
ab
infimo
orificio
C
mercurius
in
ae-
re
profluet
quouſque
altitudo
CB
fuerit
vnius
cubiti
, &
quadrantis
pro-
ximè
.
Hic
concipi
debet
cylindrus
aereus
SG
vſque
ad
ſupremam
regio-
[Figure 85]
nis
aeris
ſuperficiem
extenſus
,
qui
re-
flexus
per
EC
vim
faciat
contra
preſſionem
mercu-
rij
BC,
eumque
ſuſpendat
, &
ſic
liberè
concedo
ad-
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