Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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ſcet in fundo ipſius aquæ, quia nimirum locum non
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habet libræ, aut ſiphonis operatio. </
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<
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perſpicuum fiet: ſupponamus baſim lignei priſmatis
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BG perfectè, & exquiſitè tangere fundum vaſis BC,
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ſcilicèt ſi ambę ſuperficies fuerint explanatæ, & læ
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uigatæ, tunc profectò aqua FC, licèt grauior ſit ipſo
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ligno minimè excurrere poterit deorsùm cùm noņ
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adſit aditus inter ligni baſim BG, &
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putei: in
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nititur igitur atque ſuſtentatur maius pondus aquę
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FC à ſoliditate fundi GC eiuſdem putei, quare ne
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ceſsè eſt vt
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aqua collateralis FC omninò quie
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ſcat, & proindè lignum EG non aſcendet ſursùm, nec
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expelletur ab aqua collaterali quieſcente, quaprop
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ter habebimus libram BC non quidem
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circa centrum G, ſed ſtabilem, & firmam, cum in ea
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minimè contrarij motus
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partis GC, &
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ſus</
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alterius radij BG fieri poſſint ſimùl, & ſemel, vn
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de mirum non eſt lignum GE è fundo vaſis non
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Cap. 4. poſi
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tiuam leui
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tatem noņ
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dari.</
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PROP. LXXXI.
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Vis motiua eleuans lignum in aqua eſt maius pondus colla
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teralis aquæ, quæ deſcendere posſit, & præterea mo
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tu reflexo infimam ligni baſim ſursùm
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impellat.
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<
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ralis FC ſolummodò moueri deorsùm poſſit,
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ſed oportet prętere a vt reflectatur ſursùm infrà
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