Borelli, Giovanni Alfonso - De motionibus naturalibus a gravitate pendentibus

Borelli, Giovanni Alfonso, De motionibus naturalibus a gravitate pendentibus, 1670

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rectà IM parallela funibus, ſeu perpendicularis ad
horizontem ſecans KL in M planè ſectæ erunt duæ li-
bræ prædictæ in I, & M in eadem proportione reci-
proca ponderum ſuſpenſorum, ideoque puncta I, &
M erunt centra grauitatum vtriuſque libræ: quare li-
cet pondus B aſcendat p BL, tamen verum eſt duo
pondera AB in communi centro grauitatis I ſuſpenſa
circa centrum firmum G, & in termino fune-penduli
GI deſcendere directo motu, & perpendiculari ad
horizontem per IM, & hoc erat oſtendendum.

Cap. 2. dę
momentis
grauium in
fluido inna-
tantium

Cap. 2. dę
momentis
grauium in
fluido inna-
tantium

Huiuſmodi mechanicæ ſpeculationes maximè con-
ferunt ad intelligentiam motus corporum in fluidis,
pro cuius declaratione primò conſiderari debet.

PROP. VIII.

Qua ratione fiat Motus fluidi in ſiphone continuato,
& in ſeipſum reflexo.

SIt igitur ſipho ABDG in ſe ipſum reflexus cuius
brachia lateralia BN & GO directa ſint, in-
ter ſe parallela, & ad horizontem perpendiculariter
erecta & æquè ampla. includatur poſtea gutta aliqua
mercurij BC, quæ in fiſtulis anguſtis retinetur in eo-
dem ſitu collecta, reliqua verò cauitas eiuſdem fiſtulæ
BAGDC repleatur aqua; tunc ductis à punctis B, &
C & à centro grauitatis guttæ mercurialis H tribus li-
neis rectis parallelis horizonti BG, HI, & CF, & ſec-
ta HI bifariàm in L; patet quòd duo grauia, mercu-
rius nempe BC, & aqua GF ſuſpenduntur in eadem̨

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