Fabri, Honoré, Dialogi physici in quibus de motu terrae disputatur, 1665

Table of figures

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              <s id="s.001161">
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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. </s>
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            <figure id="id.025.01.104.1.jpg" xlink:href="025/01/104/1.jpg" number="35"/>
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              <s id="s.001162">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
                <expan abbr="autẽ">autem</expan>
              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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              <s id="s.001163">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
                <expan abbr="convexã">convexam</expan>
              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. </s>
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            <figure id="id.025.01.104.2.jpg" xlink:href="025/01/104/2.jpg" number="36"/>
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              <s id="s.001164">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. </s>
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              <s id="s.001165">
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              Auguſtin.
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              <s id="s.001166"> 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? </s>
              <s id="s.001167">aut illa parabola? </s>
              <s id="s.001168">cur ini­
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              tio aſcenſus, cylindri aërei faſtigium à Plano pa-</s>
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