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

Table of figures

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              <s id="s.001580">
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              Antim.
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              <s id="s.001581"> Faciam capias. </s>
              <s id="s.001582">Sit tubus AB ſemper aquâ plenus, ſit fiſtula
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                <figure id="id.025.01.143.1.jpg" xlink:href="025/01/143/1.jpg" number="47"/>
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              primum GH, per quam aqua extruditur, vi
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              ponderis AB. haud dubiè ſi ſit fiſtula GI duplo
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              longior, extrudetur aqua per GH, velociore
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              motu, & tardiore per GI. experientia hujus rei
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              perſpecta eſt; quia ſæpè probata; ratio verò
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              non ita fortè cuipiam in promptu eſt. </s>
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            <p type="main">
              <s id="s.001583">
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              Auguſtin.
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              <s id="s.001584"> Iam mihi venit in mentem; nem­
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              pe vis eadem motrix minus mobile velociùs,
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              majus verò tardiùs movet; quid mirum igitur,
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              ſi minorem aquæ molem fiſtula GH contentam,
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              vis ponderis GH faciliùs & velociùs extrudat,
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              quàm duplò majorem contentam fiſtula GI. im­
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              mò facilè crediderim, motus eſſe, vt longitudines
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              permutando. </s>
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            <p type="main">
              <s id="s.001585">
                <emph type="italics"/>
              Antim.
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              <s id="s.001586"> Ab hoc vltimo incipio, quod manifeſtè falſum eſſe, demon­
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              ſtro, nempe inde ſequeretur infinitè velociùs extrudi aquam per nudum &
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              nulla fiſtula inſtructum foramen B, quàm per fiſtulam quamlibet etiam bre­
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              viſſimam; prætereà cùm per fiſtulam GH, aut GI aqua extruſa motu
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              æquabili moveri cenſeatur, acquiſito ſcilicet in ipſa extruſione, id eſt, in
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              ipſo foramine: ſi in præciſa vi motrice ſiſtamus, cùm hæc æqualem mo­
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              tum omnibus partibus extruſis imprimat, quem deinde retinent per totam
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              fiſtulæ longitudinem, non videtur, cur velociùs per breviorem, tardiùs per
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              longiorem moveatur; aliunde igitur illa motuum inæqualitas petenda
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              eſt; nimirum ab impedimento & reſiſtentia fiſtulæ; nempe cava illa ſuper­
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              ficies, non ita eſt lævigata, quin aliquid ſcabrum, aliquæ ſalebræ, ſtriæ, aut
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              rugæ inſint; cum enim aqua nullum ſpatium liberum habeat intra fiſtu­
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              lam, vix credi poteſt, quantum inde illius curſus retardetur; & verò aquæ
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              currentis ſuperficies adeò plana eſſe non ſolet, præſertim ſi velociore motu
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              fluat; vt igitur ſuperficies aquæ convexa probè congruat ſuperficiei cavæ
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              fiſtulæ, id certè non ſponte, ſed vi quadam fieri dumtaxat poteſt; vnde illius
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              curſum retardari neceſſe ſit: cùm igitur in longiore fiſtula longior ſit ſu­
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              perficies, longius ſeu majus erit impedimentum; igitur per longiorem fi­
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              ſtulam plus remoræ nacta, tardius aqua extruditur. </s>
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            <p type="main">
              <s id="s.001587">
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              Auguſtin.
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              <s id="s.001588"> In qua porro proportione vnus motus alium ſuperat? </s>
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            <p type="main">
              <s id="s.001589">
                <emph type="italics"/>
              Antim.
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              Hæc proportio ita inveniri poteſt; comparetur aquæ quantitas
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              extruſa per nudum foramen B, factum in lamina quaſi indiviſibili, cùm ea
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              quæ per fiſtulam GH extruditur, æquali tempore, motus erunt vt quanti­
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              tates permutando; fiatque vt differentia quantitatum ſit ad aliam vt GH,
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              ad GI, id eſt, in ratione dupla, erit aqua extruſa per GH ad extruſam per
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              GI, vt aqua extruſa per nudum foramen, minus prima differentia ad ean­
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              dem, minùs ſecunda differentia; erunt autem motus vt quantitates aquæ
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              extruſæ: hic non conſidero modicam illam & inſenſibilem reſiſtentiam,
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              quæ procedit à peripheria foraminis laminæ; quia hæc ſupponitur indivi­
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              ſibilis ſuperficies, ac proinde quælibet ſuperficies cava ad illam peripheriam </s>
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