Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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propterea quòd niſus grauitatis non exercetur late
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raliter, ſed deorsùm. </
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Cap. 3. flui
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dum in ſuo
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toto quie
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ſcens pon
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derat.</
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<
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id
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">Hinc colligitur, quòd quotieſcumque ſupremum
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lanæ inuolucrum perpendicularitèr incumbens ſu
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peralterum, ſi ipſum non flecteret, nec ſtringeret,
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tunc planè affirmandum eſſet lanam ſuperpoſitam̨
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minimè ſuper ſubiectam lanam grauitatem exercere. </
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<
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id
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">His poſitis, ſupremum lanæ inuolucrum applica
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ri poteſt ſuper infimum dum hoc actu per aerem mo
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uetur deſcendendo deorſum, vel dum quieſcit à pla
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no ſtabili fultum; in primo caſu manifeſtum eſt,
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quòd inuolucra æqualia eiuſdem lanæ æquales gra
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dus velocitatum
<
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abbr
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habẽt
">habent</
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>
, quibus naturaliter deſcen
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dunt; igitur ſupremum inuolucrum non deſcendet
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tardiori, vel celeriori motu quàm ſibi
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abbr
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ſubiectũ
">ſubiectum</
expan
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, pro
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indeque æquali velocitare ſuprema lana compri
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mere conatur ſubiectam lanam, ac iſta nititur effu
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gere perſequentem; proptereaque ſe mutuo placi
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do contactu ſolummodò exoſculantur, nec ſubiecta
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inflectetur, aut comprimetur à ſuperſtante lana:
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igitur, ex ſuperiùs dictis incumbens lana nequè
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abbr
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põ-dus
">pon
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dus</
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, neque grauitatem exercebit ſupra fugientem
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lanam ſubiectam. </
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<
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id
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">In ſecundo verò caſu ſi poſtquàm
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in quiete ſubiecta lana compreſſa eſt à ſuperincum
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bente ambas demittamus, & liberè deorſum
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abbr
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deſcẽ-dere
">deſcen
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dere</
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concedamus, pateteas motum inchoare quan
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do iam reſtrictæ, & conſtipatæ ſunt, & ideò in pro
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greſſu licèt paribus velocitatibus deſcendant, reti
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n bunt tamen eandem conſtipationem, quam prius </
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