Fabri, Honoré
,
Dialogi physici in quibus de motu terrae disputatur
,
1665
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139
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025/01/143.jpg
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type
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Antim.
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<
s
id
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s.001581
"> Faciam capias. </
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<
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id
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s.001582
">Sit tubus AB ſemper aquâ plenus, ſit fiſtula
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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. </
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Auguſtin.
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</
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<
s
id
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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. </
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id
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<
emph
type
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italics
"/>
Antim.
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type
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"/>
</
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<
s
id
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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. </
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Auguſtin.
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emph.end
type
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</
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>
<
s
id
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s.001588
"> In qua porro proportione vnus motus alium ſuperat? </
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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 </
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