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

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            <s xml:id="echoid-s6335" xml:space="preserve">
              <pb o="95" file="0113" n="113" rhead=""/>
            viſibilibus obvenit) majus apparet. </s>
            <s xml:id="echoid-s6336" xml:space="preserve">Nam ſi arcus MNB oculi ſu-
              <lb/>
              <note position="right" xlink:label="note-0113-01" xlink:href="note-0113-01a" xml:space="preserve">Fig. 148.</note>
            perficiem repræſentet, _(pupilli amplitudini reſpondentem)_ linea XY
              <lb/>
            fundum oculi, A locum diſtinctæ viſionis; </s>
            <s xml:id="echoid-s6337" xml:space="preserve">ejuſmodi lucens ad A po-
              <lb/>
            ſitum ſatìs anguſtum circa Z ſpatium illuſtrabit; </s>
            <s xml:id="echoid-s6338" xml:space="preserve">ad E verò conſtitu-
              <lb/>
            tum, validè radios vibrans, totum coruſcatione ſuâ ſpatium OP
              <lb/>
            afficiet; </s>
            <s xml:id="echoid-s6339" xml:space="preserve">ad F denique collocatum adhuc majus intervallum R S per-
              <lb/>
            cellet, indéque grandiorem ſui ſpeciem exhibebit. </s>
            <s xml:id="echoid-s6340" xml:space="preserve">In placidè verò
              <lb/>
            lucem remittentibus aliter ſe habet, quoniam pauciores, & </s>
            <s xml:id="echoid-s6341" xml:space="preserve">langui-
              <lb/>
            diùs agentes qui extremis O, P vel R, Sallabuntur radii nullam ſui
              <lb/>
            perceptionem excitant.</s>
            <s xml:id="echoid-s6342" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6343" xml:space="preserve">Eo lubentius hanc, adeò perſpicuam, hujuſmodi _Phænomeγων_ aſſig-
              <lb/>
            namus rationem, quoniam in eorum reddendis cauſis ità titubat magnus
              <lb/>
            ille _Galilæus,_ neſcio quos, ex refractionibus, relectionibúsve quibuſdam
              <lb/>
            commentitiis oriundos, aſcititios ſuggerens cincinnos.</s>
            <s xml:id="echoid-s6344" xml:space="preserve">‖</s>
          </p>
          <p>
            <s xml:id="echoid-s6345" xml:space="preserve">XXX. </s>
            <s xml:id="echoid-s6346" xml:space="preserve">Quin hic tandem _Dioptricam ſimplicens circularem claude_-
              <lb/>
            _mus,_ quam utcunque quàm pauciſſimis ità complexi ſumus, ut præ-
              <lb/>
            cipua ſaltem (quæ videbantur) & </s>
            <s xml:id="echoid-s6347" xml:space="preserve">notatu digniora perſtrinxerimus.
              <lb/>
            </s>
            <s xml:id="echoid-s6348" xml:space="preserve">priùs autem _Catoptricam cir cularem_; </s>
            <s xml:id="echoid-s6349" xml:space="preserve">nec non utramque, tam Di-
              <lb/>
            _optricam_ quàm _Catoptricam,_ planam, quantum inſtituto noſtro viſum
              <lb/>
            eſt congruere, pertractavimus. </s>
            <s xml:id="echoid-s6350" xml:space="preserve">quibus perfuncto mihi propoſitum
              <lb/>
            aliquando fuit ad curvas alias, conicas præſertim ſectiones, haud diſſi-
              <lb/>
            mili methodo pertentandas cogitationem extendere. </s>
            <s xml:id="echoid-s6351" xml:space="preserve">Sed enim, cùm
              <lb/>
            in his tricis _Geometricis_ etiamnum ſatìs ſupérque commoratus ſim; </s>
            <s xml:id="echoid-s6352" xml:space="preserve">
              <lb/>
            & </s>
            <s xml:id="echoid-s6353" xml:space="preserve">præter ea quæ circa conicas ſectiones à nobis pridem inſinuata ſunt
              <lb/>
            (quæ & </s>
            <s xml:id="echoid-s6354" xml:space="preserve">ab aliis luculentè tractata proſtant) reliqua non ità magnum
              <lb/>
            uſum ſpondeant; </s>
            <s xml:id="echoid-s6355" xml:space="preserve">contentus haſce primarias, in uſu maximè poſitas,
              <lb/>
            & </s>
            <s xml:id="echoid-s6356" xml:space="preserve">uſui præſertim accommodatas ſuperficies, ultra paullò quàm hacte-
              <lb/>
            nùs attentatum aut peractum ſcirem, excuſſiſſe; </s>
            <s xml:id="echoid-s6357" xml:space="preserve">cæteras omninò
              <lb/>
            miſſas faciam.</s>
            <s xml:id="echoid-s6358" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6359" xml:space="preserve">XXXI. </s>
            <s xml:id="echoid-s6360" xml:space="preserve">Porrò, quoad inflectiones iſtas, quos pluribus ſucceſſivè
              <lb/>
            planis, aut Sphæricis Superficiebus, utcunque conſtitutis aut compoſitis,
              <lb/>
            incidentes ſubeunt radii; </s>
            <s xml:id="echoid-s6361" xml:space="preserve">quæ conveniunt illis Symptomata, poſſunt ea
              <lb/>
            de præmiſſis elici; </s>
            <s xml:id="echoid-s6362" xml:space="preserve">quorum certè præcipuum eſt, quod apparentis
              <lb/>
            puncti locum reſpicit ab inflectionibus ad iſtas ſuperficies factis reſul-
              <lb/>
            tantem; </s>
            <s xml:id="echoid-s6363" xml:space="preserve">in hoc enim indagando, determinandóque potiſſimùm hæ
              <lb/>
            diſquiſitiones verſantur; </s>
            <s xml:id="echoid-s6364" xml:space="preserve">Hunc igitur ſaltem definitum exhibebimus,
              <lb/>
            idque ſatìs commodè, ex uno quodam Theoremate, ſeu regula gene-
              <lb/>
            rali; </s>
            <s xml:id="echoid-s6365" xml:space="preserve">cui exempla quædam, communis usûs in gratiam ſelecta, eorúm-
              <lb/>
            que qui in hæc inciderit minuendo labori præſertim comparata, ſubjun-
              <lb/>
            gemus. </s>
            <s xml:id="echoid-s6366" xml:space="preserve">Iſta verò, nè jam tædio Sinus, ſequenti reſervamus.</s>
            <s xml:id="echoid-s6367" xml:space="preserve"/>
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