Borelli, Giovanni Alfonso - De motionibus naturalibus a gravitate pendentibus

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1
tur ab E per FZ versùs I, & ſic à prædicto motu circu
lari aquæ ambientis lignum expelletur ſursùm; atta
men ratio mechanica huius actionis pendet ex eo,
quòd libra horizontalis imaginaria PO flectitur per
petuò deorsùm quidem ad partes centri grauitatis Y
circa centrum Q, & ſursùm ad partes O. ſed ſummo
perè animaduertendum eſt prædictam libram imagi
nariam horizontalem renouari ſucceſſiuè prout lignum
aſcendit, comparaturque cum alijs lateralibus priſma
tibus aqueis, quæ ſucceſſiuè offendit intercepta in
ter prædicta plana horizontalia GB, & HC: neceſsè
ergo eſt vt lignum prædictum numquàm quieſcat in
tra aquam demerſum quòuſque ad ſupremam libellam
aquæ RX perducatur; inſuperque aliqua eius por
tio emineat.

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

COR OLLARIVM.

Hinc patet veritas Archimedei aſſumpti, quòd
fluidi conſiſtentis natura requirit vt partium eius æ
què iacentium magis compreſſæ ſursùm impellant
partes minus preſſas perpendiculariter ad horizontem.

Quia aqua ſubiecta HCTS ob eius conſiſtentiam̨
non condenſatur, & mobilis eſt, quia fluida, ergo li
bram flexibilem conſtituit, eſtque pars ſubiecta HV
magis compreſſa quàm DT (propterea quòd pars a
quea GD grauior eſt ligno AC) igitur libra fluida
HDC flecti debet deſcendendo HD & DC aſcen
dendo, quare tota aqua HSVD deorsùm depreſſa im
pellet aquam DVTC ſursùm.

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