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

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          <p>
            <s xml:id="echoid-s6405" xml:space="preserve">
              <pb o="97" file="0115" n="115" rhead=""/>
            deprehenduntur). </s>
            <s xml:id="echoid-s6406" xml:space="preserve">addo, confuſionis evitandæ causâ ſymbolum I
              <lb/>
            dehinc in his exemplis perpetuò majorem proportionis refractiones
              <lb/>
            dimetientis terminum denotare, quocunque de medio in quodcunque
              <lb/>
            peragatur refractio. </s>
            <s xml:id="echoid-s6407" xml:space="preserve">porrò, medium primum infringens perpetuò
              <lb/>
            denſius intelligatur rariori circundatum. </s>
            <s xml:id="echoid-s6408" xml:space="preserve">item, in figuris appoſitis
              <lb/>
            litera C denotat centrum anterioris circuli, K centrum poſterioris;
              <lb/>
            </s>
            <s xml:id="echoid-s6409" xml:space="preserve">& </s>
            <s xml:id="echoid-s6410" xml:space="preserve">B verticem anterioris, D verticem poſterioris; </s>
            <s xml:id="echoid-s6411" xml:space="preserve">denuò deſignat Y
              <lb/>
            locum imaginis quæſitam.</s>
            <s xml:id="echoid-s6412" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6413" xml:space="preserve">Hiſce præmonitis, primum de longinquo radiantium, ſeu paralle-
              <lb/>
            los ejicientium radios punctorum imagines, pro lentium varietate, ſic
              <lb/>
            determinantur.</s>
            <s xml:id="echoid-s6414" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s6415" xml:space="preserve">_I._ </s>
            <s xml:id="echoid-s6416" xml:space="preserve">Ad lentem plano-convexam.</s>
            <s xml:id="echoid-s6417" xml:space="preserve"/>
          </p>
          <note position="right" xml:space="preserve">Fig. 151.</note>
          <p style="it">
            <s xml:id="echoid-s6418" xml:space="preserve">_II._ </s>
            <s xml:id="echoid-s6419" xml:space="preserve">Ad lentem plano-concavam.</s>
            <s xml:id="echoid-s6420" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6421" xml:space="preserve">Fiat I- R. </s>
            <s xml:id="echoid-s6422" xml:space="preserve">R :</s>
            <s xml:id="echoid-s6423" xml:space="preserve">: DK. </s>
            <s xml:id="echoid-s6424" xml:space="preserve">DY.</s>
            <s xml:id="echoid-s6425" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6426" xml:space="preserve">_In Vitro_ eſt DY = {3/2} KD.</s>
            <s xml:id="echoid-s6427" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6428" xml:space="preserve">_In Aqua_ eſt DY = 3 KD.</s>
            <s xml:id="echoid-s6429" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6430" xml:space="preserve">_III._ </s>
            <s xml:id="echoid-s6431" xml:space="preserve">Ad lentem convexo-planam.</s>
            <s xml:id="echoid-s6432" xml:space="preserve"/>
          </p>
          <note position="right" xml:space="preserve">Fig. 151,
            <lb/>
          152.</note>
          <p style="it">
            <s xml:id="echoid-s6433" xml:space="preserve">_IV._ </s>
            <s xml:id="echoid-s6434" xml:space="preserve">Ad lentem concavo-planam.</s>
            <s xml:id="echoid-s6435" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6436" xml:space="preserve">Fiat {I - R. </s>
            <s xml:id="echoid-s6437" xml:space="preserve">I :</s>
            <s xml:id="echoid-s6438" xml:space="preserve">: BC. </s>
            <s xml:id="echoid-s6439" xml:space="preserve">BZ; </s>
            <s xml:id="echoid-s6440" xml:space="preserve">& </s>
            <s xml:id="echoid-s6441" xml:space="preserve">\\ I. </s>
            <s xml:id="echoid-s6442" xml:space="preserve">R :</s>
            <s xml:id="echoid-s6443" xml:space="preserve">: DZ. </s>
            <s xml:id="echoid-s6444" xml:space="preserve">DY.</s>
            <s xml:id="echoid-s6445" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6446" xml:space="preserve">_In Vitro_ DY = {3/2} BC - {3/5} BD.</s>
            <s xml:id="echoid-s6447" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6448" xml:space="preserve">_In Aqua_ DY = 3 BC - {3/4} BD.</s>
            <s xml:id="echoid-s6449" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s6450" xml:space="preserve">_V._ </s>
            <s xml:id="echoid-s6451" xml:space="preserve">Ad lentem convexo convexam.</s>
            <s xml:id="echoid-s6452" xml:space="preserve"/>
          </p>
          <note position="right" xml:space="preserve">Fig. 152.</note>
          <p style="it">
            <s xml:id="echoid-s6453" xml:space="preserve">_VI._ </s>
            <s xml:id="echoid-s6454" xml:space="preserve">Ad lentem concauo-concauam.</s>
            <s xml:id="echoid-s6455" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6456" xml:space="preserve">Fiat {I- R. </s>
            <s xml:id="echoid-s6457" xml:space="preserve">I :</s>
            <s xml:id="echoid-s6458" xml:space="preserve">: BC. </s>
            <s xml:id="echoid-s6459" xml:space="preserve">BZ; </s>
            <s xml:id="echoid-s6460" xml:space="preserve">& </s>
            <s xml:id="echoid-s6461" xml:space="preserve">\\ {I/R} KZ - DZ. </s>
            <s xml:id="echoid-s6462" xml:space="preserve">DZ :</s>
            <s xml:id="echoid-s6463" xml:space="preserve">: DK. </s>
            <s xml:id="echoid-s6464" xml:space="preserve">DY.</s>
            <s xml:id="echoid-s6465" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s6466" xml:space="preserve">_Coroll._ </s>
            <s xml:id="echoid-s6467" xml:space="preserve">Adintegram Spharam.</s>
            <s xml:id="echoid-s6468" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6469" xml:space="preserve">Fiat 2 I - 2 R. </s>
            <s xml:id="echoid-s6470" xml:space="preserve">I :</s>
            <s xml:id="echoid-s6471" xml:space="preserve">: CD. </s>
            <s xml:id="echoid-s6472" xml:space="preserve">CY.</s>
            <s xml:id="echoid-s6473" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s6474" xml:space="preserve">_VII._ </s>
            <s xml:id="echoid-s6475" xml:space="preserve">Adlentem conuexo-concauam.</s>
            <s xml:id="echoid-s6476" xml:space="preserve"/>
          </p>
          <note position="right" xml:space="preserve">Fig. 152,
            <lb/>
          153.</note>
          <p style="it">
            <s xml:id="echoid-s6477" xml:space="preserve">_VIII._ </s>
            <s xml:id="echoid-s6478" xml:space="preserve">Ad lentem concauo conuexam.</s>
            <s xml:id="echoid-s6479" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6480" xml:space="preserve">Fiat I - R. </s>
            <s xml:id="echoid-s6481" xml:space="preserve">I :</s>
            <s xml:id="echoid-s6482" xml:space="preserve">: BC. </s>
            <s xml:id="echoid-s6483" xml:space="preserve">BZ. </s>
            <s xml:id="echoid-s6484" xml:space="preserve">&</s>
            <s xml:id="echoid-s6485" xml:space="preserve"/>
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