Barrow, Isaac, Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur

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        <div xml:id="echoid-div58" type="section" level="1" n="14">
          <p>
            <s xml:id="echoid-s2568" xml:space="preserve">
              <pb o="46" file="0064" n="64" rhead=""/>
            lari AB conſtituto, non in ſuo loco (quod juxta dictam ſententiam
              <lb/>
            oportuit) aſt pro mediorum diverſitate, (perquam ſenſibili inter vallo)
              <lb/>
            citeriùs adſpectatur, aut ulteriùs. </s>
            <s xml:id="echoid-s2569" xml:space="preserve">Sed effatum hoc noſtrum (eíque
              <lb/>
            quoad reliquos in Catoptricis, Dioptricíſque caſus ſimiles conſona)
              <lb/>
            tametſi novitium, & </s>
            <s xml:id="echoid-s2570" xml:space="preserve">nullâ quod ſciam hactenus auctoritate fultum,
              <lb/>
            cùm forſan expoſitum dilucidiùs, tum penitiſſimè dabimus confir-
              <lb/>
            matum, ſi quando nos de imaginum natura, locóque ſpeciatim
              <lb/>
            evenerit diſſertare. </s>
            <s xml:id="echoid-s2571" xml:space="preserve">Mihi ſaltem videtur hæc Scientia quoad hanc
              <lb/>
            partem ſuam, certè palmariam (utì reperitur hactenus tractata)
              <lb/>
            perquam mutila, nè dicam admodùm vitioſa; </s>
            <s xml:id="echoid-s2572" xml:space="preserve">nec aliò ferè collima-
              <lb/>
            mus quàm ut aliquouſque ſuppleamus eam, ac ſanemus.</s>
            <s xml:id="echoid-s2573" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s2574" xml:space="preserve">XXI. </s>
            <s xml:id="echoid-s2575" xml:space="preserve">Proximè dictis confirmandis idoneum haud illepidum expe-
              <lb/>
              <note position="left" xlink:label="note-0064-01" xlink:href="note-0064-01a" xml:space="preserve">Fig. 63.</note>
            rimentum interſeremus. </s>
            <s xml:id="echoid-s2576" xml:space="preserve">Aqueæ Superficiei RS (ſtagnanti, & </s>
            <s xml:id="echoid-s2577" xml:space="preserve">
              <lb/>
            immotæ deſuper immineat objectum HG; </s>
            <s xml:id="echoid-s2578" xml:space="preserve">ejus autem punctum G ra-
              <lb/>
            dat perpendiculum EF (filum puta candidum, aut ſtylus, cui
              <lb/>
            plumbum F appenditur) videbitur itaque punctum G (oculo O) ex
              <lb/>
            reflectione in ipſà perpendiculari GB velut ad γ; </s>
            <s xml:id="echoid-s2579" xml:space="preserve">at perpendiculi
              <lb/>
            punctum F (admodum notabili diſtantiâ) citra lineam B γ aſpicitur
              <lb/>
            (velut ad φ) id quod ex ſententia noſtra factum oportuit; </s>
            <s xml:id="echoid-s2580" xml:space="preserve">& </s>
            <s xml:id="echoid-s2581" xml:space="preserve">_Albaze-_
              <lb/>
            _ni_, ſequaciúmque doctrinam liquidò deſtruit.</s>
            <s xml:id="echoid-s2582" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s2583" xml:space="preserve">XXII. </s>
            <s xml:id="echoid-s2584" xml:space="preserve">Subjicio tandem ex his comparere modum genuinam refra-
              <lb/>
            ctariam quam vocant (per quam nempe recta linea repræſentatur
              <lb/>
            in aquæ fundo conſpicua) lineam deſignandi; </s>
            <s xml:id="echoid-s2585" xml:space="preserve">cujus loco complures
              <lb/>
            (utique non eandem omnes, aſt aliam alii) Chimæram inani ſunt
              <lb/>
            operà proſequuti; </s>
            <s xml:id="echoid-s2586" xml:space="preserve">de quâ _Carteſius_ ipſe percontanti _Merſenno_ ſic
              <lb/>
            reſpondit: </s>
            <s xml:id="echoid-s2587" xml:space="preserve">“ Non poteſt facilè determinari qualem figuram linea viſa
              <lb/>
              <note position="left" xlink:label="note-0064-02" xlink:href="note-0064-02a" xml:space="preserve">Tom. II. Epiſt.
                <lb/>
              73.</note>
            in fundo aquæ ſit habitura; </s>
            <s xml:id="echoid-s2588" xml:space="preserve">neque enim certus eſt aliquis ima-
              <lb/>
            ginis locus in reſlexis aut reſractis, quemadmodum ſibi vulgò per-
              <lb/>
            ſuaſerunt Optici. </s>
            <s xml:id="echoid-s2589" xml:space="preserve">lmò verò (tanti viri pace) cùm ſpeciale quodvis
              <lb/>
            objectum (per ejuſdem generis & </s>
            <s xml:id="echoid-s2590" xml:space="preserve">eodem modo terminatum medium
              <lb/>
            aſpectabile) ſimilem conſtanter exhibeat ſpeciem ſui, ſimili ſitu diſpo-
              <lb/>
            ſitam, ſimili præditam figurâ; </s>
            <s xml:id="echoid-s2591" xml:space="preserve">non video quin ex parte rei certum
              <lb/>
            imago locum ſortiatur; </s>
            <s xml:id="echoid-s2592" xml:space="preserve">cujus certè (quoad illum qui præ manibus
              <lb/>
            eſt caſum) quotcunque puncta non difficilè poterunt è præcedentibus
              <lb/>
            determinari. </s>
            <s xml:id="echoid-s2593" xml:space="preserve">quinimò nullius non. </s>
            <s xml:id="echoid-s2594" xml:space="preserve">ex hujuſmodi planam ad ſuperfici-
              <lb/>
            em refractione ſubnaſcentis phænomeni (quoad ejus intelligo figuram)
              <lb/>
            cauſa verè, nì fallor, hinc & </s>
            <s xml:id="echoid-s2595" xml:space="preserve">promptè poſſit aſſignari. </s>
            <s xml:id="echoid-s2596" xml:space="preserve">verùm hæc circa
              <lb/>
            planas ſuperficies dicta ſuſſicient; </s>
            <s xml:id="echoid-s2597" xml:space="preserve">ad curvas nos proximè conferemus. </s>
            <s xml:id="echoid-s2598" xml:space="preserve">‖</s>
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