Fabri, Honoré
,
Dialogi physici in quibus de motu terrae disputatur
,
1665
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vllus obſervarit, quando minor eſt aëris portio, tornari etiam &
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turbinati inferiorem aëris baſim, quaſi ad inſtar lentis, innno ſi adhuc
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minor ſit, ad inſtar rotundæ gemmæ apparet; an fortè quia hæc figu
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ra ab aqua ambiente inducitur, cùm inter omnes ſimpliciſſima ſit, &
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inter æquales minimam ſuperficiem habeat; ſed hæc tantulum figuræ de
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ſiderant. </
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">Sit tubus AD vitreus, plenus aqua, excepta por
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tone aëris, quæ ſi innataret occuparet cylindrum
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FG ; primùm ita reſtringitur, vt baſis diameter ſit
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TV, occupante aqua Spatia HTGV, ex cujus
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lapſu, cùm duo corpora ſeſe penetrare non poſſint,
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cylindrum aëris reſtringi ac turbinari versùs K, vbi
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labens aqua versùs & ſecus latera, locum illi cedit
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prorſus neceſſe eſt: cùm
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autẽ
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aqua per ſpatia HTGV
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deſcendens ſpiratim, præ impetu, in aquam conten
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tam cylindri portione CE altè ſubeat, ſuperficies
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aquæ FE neceſſariò attollitur; vnde portionem aë
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ris I ſurſum extrudi, neceſſe eſt; idque ſenſim, in
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proportione aſſignabili; detracto enim cylindro ſub
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baſi TV, ex cylindro FG, vt reſiduum ad cylin
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drum FG, ita motus baſis TV ad motum aquæ la
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bentis per ſpatia HTGV, præſcindendo à ſpira.
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<
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">Iam verò ſit cylindrus aëris OM minor priore; at
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tollitur quidem in X, & cum aqua lapſa versùs N reflectatur à lateribus
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tubi, ſtatimque cum aqua inferiore miſceatur, ita vt per ſpiram integram
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minimè deſcendat, quaſi tondet marginem inferioris baſis cylindruli aë
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ris, eamque in ſuperficiem
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convexã
">convexam</
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NPM facilè tornat; Porrò ab illa ſpira
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non integra labentis aquæ, lens aëris extruſa ſurſum, huc illuc libratur
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eundo, quia cùm modò hinc, modò illinc labens aqua ſeſe ſubjiciat aëri,
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quid mirum, ſi prædicta libratio, ſeu tremor quidam conſequatur:
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quod etiam accidit in cylindrulis aëris minoribus, propter eandem
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rationem; in majoribus enim deſcendens aqua cum majore impetu
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aliam aquam ſubit, vnde hæc ſecundùm Planum horizontale ſenſim at
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tollitur. </
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<
s
id
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">Sit demum tubus AC in ſitu inclinato, cylindrus
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aëris EH ita conformatur, vt convexitas MFN multo
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longiùs producatur, quàm connexitas ME; nempe
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aqua gravior in latus inferius CB inclinat & versùs
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punctum H lateris inferioris CB deſinunt ſpiræ, quod ad
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oculum patet. </
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Auguſtin.
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<
s
id
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"> Ex iis omnibus manifeſtum fit, aëra
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ſurſum ab aqua extrudi, non verò ſua ſponte ire;
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alioquin cur illæ ſpiræ? </
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<
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">aut illa parabola? </
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<
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id
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">cur ini
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tio aſcenſus, cylindri aërei faſtigium à Plano pa-</
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