Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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tur ab E per FZ versùs I, & ſic à prædicto motu circu
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lari aquæ ambientis lignum expelletur ſursùm; atta
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men ratio mechanica huius actionis pendet ex eo,
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quòd libra horizontalis imaginaria PO flectitur per
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petuò deorsùm quidem ad partes centri grauitatis Y
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circa centrum Q, & ſursùm ad partes O. ſed ſummo
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perè animaduertendum eſt prædictam libram imagi
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nariam horizontalem renouari ſucceſſiuè prout
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aſcendit,
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cum alijs lateralibus priſma
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tibus aqueis, quæ ſucceſſiuè offendit intercepta in
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ter prædicta plana horizontalia GB, & HC: neceſsè
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ergo eſt vt lignum prædictum numquàm quieſcat in
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tra aquam demerſum quòuſque ad ſupremam
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abbr
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libellã
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aquæ RX perducatur; inſuperque aliqua eius por
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tio emineat. </
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Cap. 2. dę
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momentis
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grauium in
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fluido inna
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tantium.</
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COR OLLARIVM.
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<
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id
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">Hinc patet veritas Archimedei aſſumpti, quòd
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fluidi conſiſtentis natura requirit vt partium eius æ
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què iacentium magis compreſſæ ſursùm impellant
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partes minus preſſas perpendiculariter ad
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abbr
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horizontẽ
">horizontem</
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. </
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<
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id
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">Quia aqua ſubiecta HCTS ob eius conſiſtentiam̨
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non condenſatur, & mobilis eſt, quia fluida, ergo li
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bram flexibilem conſtituit,
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eſtq;
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pars ſubiecta HV
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magis compreſſa quàm DT (propterea quòd pars a
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quea GD grauior eſt ligno AC) igitur libra fluida
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HDC flecti debet deſcendendo HD & DC aſcen
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dendo, quare tota aqua HSVD deorsùm depreſſa im
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pellet aquam DVTC ſursùm. </
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