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

Table of figures

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            <pb pagenum="103" xlink:href="025/01/107.jpg"/>
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              <s id="s.001202">
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              Auguſtin.
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              <s id="s.001203"> De re mihi non conſtat, nunquam enim hoc à me obſerva­
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              tum eſt. </s>
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              <s id="s.001204">
                <emph type="italics"/>
              Antim.
                <emph.end type="italics"/>
              </s>
              <s id="s.001205"> Omninò diſtinguendum eſt; ſi enim tale eſt, vt tantumdem
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              aquæ per illud effluat, quantum infra cylindrum deſcendit; cylindrus
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              erit immobilis; ſi minùs deſcendat, quàm effluat, cylindrus ipſe, ſi de­
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              ſcendere poteſt, deſcendet; ſi verò plus aquæ deſcendat, quàm ex fora­
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              mine effluat, tantulùm cylindrus aſſurgit. </s>
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            <p type="main">
              <s id="s.001206">
                <emph type="italics"/>
              Auguſtin.
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              </s>
              <s id="s.001207"> Hoc ipſum perſpicuè probat, corpus leve non attolli ſua
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              ſponte; quod enim gravius deorſum deſcendat, non impedit, quò minùs
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              leve ſua ſponte aſcendat: ſed accipe luculentum experimentum, iis ta­
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              men ſimile, quæ jam expoſita fuere. </s>
              <s id="s.001208">Sit pixis quælibet, in cujus fundo he­
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              miſphærium, vel minor Sphæræ portio accuratè & affabrè ita excavetur,
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              vt Sphæram ligneam omninò capiat, nulla relicta intercapedine; tum
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              pixis impleatur aqua; Sphærula lignea, quamvis levior, nullo modo aſ­
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              cendit; quia ſcilicet cum aqua in cavitatem illam ſubire non poſſit, ab ea
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              Sphæra ſursùm extrudi non poteſt. </s>
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            <p type="main">
              <s id="s.001209">
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              Chryſocom.
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              <s id="s.001210"> Dicerem non aſſurgere Sphæram, ne detur vacuum; idem
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              enim fieri videmus, ſi duo plana probè congruant. </s>
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            <p type="main">
              <s id="s.001211">
                <emph type="italics"/>
              Auguſtin.
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              </s>
              <s id="s.001212"> Hoc dictum iri ſciebam; ſed fiat foramen in medio cavita­
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              tis, quò ſcilicet aër ambiens facile ſubeat, non propterea Sphærula aſcen­
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              dit, licèt nullum reſtet vacui periculum: per vos etiam mihi liceat, hic
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              obiter, ea ſaltem indicare, quæ tuam illam ſententiam, Chryſocome, om­
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              ninò expugnare videntur. </s>
              <s id="s.001213">1. Quandoquidem per vnum principium
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              motus cuncta explicari poſſunt, quo ſcilicet corpus grave ſua ſponte
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              deorſum fertur, quod inficiatur nemo, & leve ſurſum extrudi poteſt,
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              fruſtra ponitur aliud principium: Hæc ratio, licèt communis ſit, maximi
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              ſanè momenti eſt. </s>
              <s id="s.001214">Secundò, cùm ab eodem centro multæ lineæ ducantur,
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              fi corpus leviſſimum eſſet, in centro, non poſſet vllo modo aſſurgere; cur
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              enim potiùs per vnam lineam quam per aliam? </s>
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            <p type="main">
              <s id="s.001215">
                <emph type="italics"/>
              Antim.
                <emph.end type="italics"/>
              </s>
              <s id="s.001216"> Facilè retorqueo argumentum, nec enim pariter ſurſum ex­
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              trudi poſſet; cur enim potiùs per vnam lineam quàm per aliam? </s>
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            <p type="main">
              <s id="s.001217">
                <emph type="italics"/>
              Auguſtin.
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              <s id="s.001218"> Hoc quidem verum eſt, modò ambiens gravius æqualis eſſet
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              momenti; per omnes lineas; ſed hoc per accidens; illud autem per ſe
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              præterea, linea motus recti à termino, ad quem determinatur; cùm au­
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              tem vnum centrum ſit, aſſumpto quolibet puncto extra centrum, ab illo
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              ad centrum vnica tantùm linea ducitur, cùm tamen ab eodem, plures ad
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              periphætiam duci poſſint; vna quidem producta ad centrum; ſed quomo­
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              do à centro determinatur hæc linea, quod neque ſit terminus ad quem,
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              nec terminus à quo illius motus? </s>
              <s id="s.001219">Tertiò non poteſt idem corpus in par­
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              tes oppoſitas ſimul moveri; igitur nec ſimul conniti, ſcilicet ab intrinſe­
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              co; quod vt meliùs intelligatur, ſit vas aqua plenum, ſitque pondus aquæ
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              40. libr. </s>
              <s id="s.001220">Sit fruſtum ligni in fundo vaſis retentum pendens 5.libr. </s>
              <s id="s.001221">appen­
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              datur ſimul vtrumque, ſuſtinebitur à 45. libris poſitis in altera lance li­
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              bræ, eritque æquilibrium, ſtatimque impedimento ſublato, lignum emer­
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              git, ſurſumque attollitur eodem prorſus æquilibrio manente; igitur hic </s>
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