Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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31 - 60
61 - 90
91 - 120
121 - 150
151 - 180
181 - 210
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361 - 390
391 - 420
421 - 450
451 - 480
481 - 510
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ma aqueum imminuitur, pondus eius quòd prius ſu
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perabat grauitatem ligni BD, tandem poſt
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continuã
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ponderis aquæ
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diminutionẽ
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reddetur præcisè æqua
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le ponderi cylindri lignei BD, & tunc coniunctis
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centris grauitatum eorum à rectą
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PO hæc quidem bifariàm ſecabi
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tur in termino Q &
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ibidẽ
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erit eius
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centrum, atque fulcimentum ha
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bebitque pondus ligni BD ad
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põ-dus
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dus</
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aquæ GD ſibi æquale
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proportionem, quam habet reciprocè PQ ad QO, &
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proindè centrum grauitatis commune Y incidet præ
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cisè in centro ſeù fulcimento libræ
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abbr
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q.
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igitur æquili
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bratis prædictis ponderibus libra quieſcet, nec priſ
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ma ligneum BD vlteriùs
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aſcẽdet
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,
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neq;
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denuò
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deorsũ
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decidet niſi ex accidenti ratione impetus acquiſiti. </
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Cap. 2. de
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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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<
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id
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">Hinc patet quòd quando primò lignum BD exur
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gere incipit ſupra aquæ libellam RX tunc continen
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ter magis ac magis centrum communis grauitatis Y
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motu obliquo, & curuo
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abbr
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aſcẽdit
">aſcendit</
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quòuſque coniunga
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tur cum fulcimento Q libræ PO ſursùm tranſlatę,
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non ſecùs, ac in ſiphone aqua eleuata in vno eius bra
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chio deſcendendo perducit centrum grauitatis eius
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per curuam lineam parabolicam, vt dictum eſt; con
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cipi ergo debet ſipho inæqualium brachiorum
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abbr
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quãdo
">quando</
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primum baſis ſuprema AB ligni attingit aquæ libel
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lam, & quia tunc exceſſus grauitatis ſpecificæ aquæ
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AH ſupra pondus ligni BD perindè agit ac ſi aliud
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fluidum æquè graue ſpecie ligno ipſi BD & maioris </
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