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

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1
Cap. 11. gra­
uia in fluido
velocitati­
bus inæqua­
libus ferri
debere.
PROP. CCXXXIX.
Si à terminis duarum librarum æqualium, & æqualium
radiorum duo pondera æqualia pendeant, ſed oppoſitis
minora, pendulum prioris libræ ad pendulum poſterioris
proportionem compoſitam habebit ex ratione differentiæ
priorum ponderum ad eorum ſummam, & ex ratione
ſummæ posteriorum ad differentiam eorumdem ponderum.
SInt duæ libræ æquales AB, & NO bifariàm ſectæ
in fulci mentis C, & K, atque ex A pendeat ma­
ius pondus D, ex N verò minus pondus G, atque iņ
174[Figure 174]
B, & O ſuſpendantur duo pon­
dera
æqualia E, & M, quorum
ſingula minora ſint quàm D,
vel G; reperianturque duo ea­
rum centra grauitatum F, &
H; dico pendulum CF ad K
H proportionem compoſitam
habere ex ratione ponderis D minus E ad D plus E,
& ex ratione G plus M ad G minus M; quoniam AC ad
CF eſt vt D plus E ad D minus E (ex præcedenti) er­
go inuertendo FC ad CA, ſeu ad ei æqualem KN ean­
dem
proportionem habet quam D minus E ad D plus
E, & NK ad KH eamdem proportionem habet, quam
G plus M ad G minus M; habet verò FC ad HK pro­
portionem compoſitam ex ratione FC ad CA, ſeu ad
NK, & ex ratione KN ad KH, ergo FC ad KH com­
poſitam proportionem habebit ex ijſdem proportio­
nibus D minus E ad D plus E, & ex G plus M ad G
minus M.

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