Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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78
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aquæ deſcendentis, nam perſeuerante vertigine, ſci
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licèt translato centro grauitatis vltrà medium in O
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ſemper ſemianulus EFG grauior eſſet, quàm GKE,
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& propterea ille ſemper deſcenderet, hìc verò ſem
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per aſcenderet, proindeque anulus excurreret mo
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tu perpetuo progreſſiuo, quod eſt falſum. </
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<
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">perſiſtit
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ergo centrum grauitatis ſemper in centro N anuli,
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ſiue aqua in eo contenta quieſcat, ſiuè circumduca
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tur, nam ob continguitatem partium aquæ non poteſt
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moueri vna pars aquæ F v. g. quin vniuerſa aquą
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EKG æquali velocitate reuoluatur, proindeque
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abbr
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nõ
">non</
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vnica pars tantùm, ſed aqua tota
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impulsũ
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, & impe
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tum acquirit, non ſecùs ac rota lignea tota ſimul ic
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tum recipit atque circa
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cẽtrum
">centrum</
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grauitatis eius æqui
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libratur, pari modo aqua contenta in vaſe AC ante
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præmiſſæ figuræ, licèt ſit fluida, habet tamen pun
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ctum M circa quod partes habent æqualia momenta,
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perinde ergo ſe habent ac ſi vniuerſa aqua in prædi
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cto vaſe contenta dura eſſet, & conſiſtens vt rota li
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gnea, vel intra fiſtulam anularem EFKG contentą
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eſſet in qua reuoluta, ſiue quieſcente rota, aut aqua
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ſemper centrum grauitatis eius in eodem ſitu perſe
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uerare debet, & proinde libra HL quieſcet in
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eodẽ
">eodem</
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ſitu horizontali. </
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<
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">Igitur dubitandum non eſt aquam̨
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in ſuo toto collocatam, grauitatem exercere, ſiuè illa
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omninò ibidem quieſcat, ſiuè quomodolibet agite
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tur, & circumuoluatur. </
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