Borelli, Giovanni Alfonso - De motionibus naturalibus a gravitate pendentibus

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

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42[Figure 42]
vt terminus eius A deſcendat
deorsùm percurrendo arcum
AI neceſsè eſt vt eius oppoſi
tus terminus B motu contrario
ſursùm aſcendat percurrendo
arcum BH æqualem contrapo
ſito AI. Et quotieſcumque præ
dicti motus contrarij ſimul fie
ri nequeunt, tunc neceſsè eſt
vt libra, vel rota quieſcatiņ
eodem ſitu, nec agitetur.

Cap. 4. poſi
tiuam leui
tatem noņ
dari.

PROP. XLVI.

Si eidem libræ termino applicentur potentiæ ad oppoſitas
partes trahentes mutuo ſeimpedient, & potentia maior
præualebit, libram flectendo vi æquali dif
ferentiæ potentiarum.

APponatur poſtea pondus DE termino libræ A;
hoc profectò vim efficit, conaturque traherę
terminum libræ A per directionem AD versùs cen
trum telluris, at quia ſemidiameter AC in centro librę
figitur immobiliter, hinc conſequetur reuolutio librę
fereturque terminus A non per lineam rectam AD,
ſed per arcum AI excurrendo integrum quadrantem,
& quia libra AB ſupponitur continua, & rigida eodem
tempore quo terminus A arcum AI pertranſit oppo
ſitus eius terminus B deſcribet contrapoſitum arcum
BH. Modò motum eiuſdem libræ, & deſcenſum pon-

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