Gravesande, Willem Jacob 's, Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1

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            <s xml:id="echoid-s13604" xml:space="preserve">
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            In hoc etiam caſu candela & </s>
            <s xml:id="echoid-s13605" xml:space="preserve">vitrum V non ſunt in eadem
              <lb/>
            linea recta cum repreſentatione illius, quod in ſitu directo
              <lb/>
            obtinet; </s>
            <s xml:id="echoid-s13606" xml:space="preserve">quo confirmatur n. </s>
            <s xml:id="echoid-s13607" xml:space="preserve">686.</s>
            <s xml:id="echoid-s13608" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s13609" xml:space="preserve">Repræ ſentatur candela in ſitu everſo, quia radii, à diver-
              <lb/>
              <note position="left" xlink:label="note-0534-01" xlink:href="note-0534-01a" xml:space="preserve">689.</note>
            ſis punctis procedentes, tranſeundo per V. </s>
            <s xml:id="echoid-s13610" xml:space="preserve">ſeſe mutuò inter-
              <lb/>
            ſecant, ut per inſpectionem fig. </s>
            <s xml:id="echoid-s13611" xml:space="preserve">1. </s>
            <s xml:id="echoid-s13612" xml:space="preserve">clarè patet. </s>
            <s xml:id="echoid-s13613" xml:space="preserve">Ex qua eadem
              <lb/>
            cauſa, ſi duæ dentur candelæ ut A & </s>
            <s xml:id="echoid-s13614" xml:space="preserve">B, repræſentatio hujus
              <lb/>
            dabitur in b illius in a.</s>
            <s xml:id="echoid-s13615" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s13616" xml:space="preserve">Omnes mutationes in lumine, de quibus in hoc capite a-
              <lb/>
              <note position="left" xlink:label="note-0534-02" xlink:href="note-0534-02a" xml:space="preserve">690.</note>
            ctum, eò magis ſunt ſenſibiles, quo ſuperficies media diri-
              <lb/>
            mens eſt magis curva, id eſt, minoris ſphæræ portio.</s>
            <s xml:id="echoid-s13617" xml:space="preserve"/>
          </p>
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        <div xml:id="echoid-div2032" type="section" level="1" n="501">
          <head xml:id="echoid-head667" xml:space="preserve">CAPUT IX.</head>
          <head xml:id="echoid-head668" style="it" xml:space="preserve">De Motu Luminis trans Medium denſius. Vbi de
            <lb/>
          Lentium affectionibus.</head>
          <p>
            <s xml:id="echoid-s13618" xml:space="preserve">VItrorum frequens uſus eſt, aëre denſiora ſunt, & </s>
            <s xml:id="echoid-s13619" xml:space="preserve">ex aëre
              <lb/>
              <note position="left" xlink:label="note-0534-03" xlink:href="note-0534-03a" xml:space="preserve">691.</note>
            in aërem trans vitrum radii penetrant. </s>
            <s xml:id="echoid-s13620" xml:space="preserve">Pro variis ſuper-
              <lb/>
            ficiebus, quibus terminatur vitrum, diverſas in hoc motu lu-
              <lb/>
            men mutationes ſubit, quæ ut determinentur, vitra, aut
              <lb/>
            media quæcunque medio rariori circumdata, & </s>
            <s xml:id="echoid-s13621" xml:space="preserve">variis ſuper-
              <lb/>
            ficiebus terminata, examinanda ſunt. </s>
            <s xml:id="echoid-s13622" xml:space="preserve">Conſiderando ſolas ſu-
              <lb/>
            perficies planas & </s>
            <s xml:id="echoid-s13623" xml:space="preserve">ſphæricas, ſex Claſſes dantur.</s>
            <s xml:id="echoid-s13624" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s13625" xml:space="preserve">I. </s>
            <s xml:id="echoid-s13626" xml:space="preserve">Medium hoc planum eſt ab utraque parte. </s>
            <s xml:id="echoid-s13627" xml:space="preserve">2. </s>
            <s xml:id="echoid-s13628" xml:space="preserve">Ab una
              <lb/>
            parte planum ab altera convexum. </s>
            <s xml:id="echoid-s13629" xml:space="preserve">3. </s>
            <s xml:id="echoid-s13630" xml:space="preserve">Ab utraque parte
              <lb/>
            convexum. </s>
            <s xml:id="echoid-s13631" xml:space="preserve">4. </s>
            <s xml:id="echoid-s13632" xml:space="preserve">Ab una parte planum ab altera cavum. </s>
            <s xml:id="echoid-s13633" xml:space="preserve">5. </s>
            <s xml:id="echoid-s13634" xml:space="preserve">ca-
              <lb/>
            vum utrimque. </s>
            <s xml:id="echoid-s13635" xml:space="preserve">6. </s>
            <s xml:id="echoid-s13636" xml:space="preserve">Terminatur ſuperficie cavâ, & </s>
            <s xml:id="echoid-s13637" xml:space="preserve">oppoſita
              <lb/>
            convexa eſt.</s>
            <s xml:id="echoid-s13638" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div2034" type="section" level="1" n="502">
          <head xml:id="echoid-head669" xml:space="preserve">
            <emph style="sc">Definitio i</emph>
          .</head>
          <p>
            <s xml:id="echoid-s13639" xml:space="preserve">Si de vitro agatur & </s>
            <s xml:id="echoid-s13640" xml:space="preserve">craſſitiem non magnam habeat in quin-
              <lb/>
              <note position="left" xlink:label="note-0534-04" xlink:href="note-0534-04a" xml:space="preserve">692.</note>
            que ultimis caſibus, vitrum tale Lens vitrea dicitur.</s>
            <s xml:id="echoid-s13641" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s13642" xml:space="preserve">In ſecundo & </s>
            <s xml:id="echoid-s13643" xml:space="preserve">tertio caſu lens dicitur convexa; </s>
            <s xml:id="echoid-s13644" xml:space="preserve">ſi tamen
              <lb/>
            hi caſus diſtinguendi ſint, in ſecundo caſu dicitur plano-con-
              <lb/>
            vexa. </s>
            <s xml:id="echoid-s13645" xml:space="preserve">Eodem modo in quarto caſu dicitur plano-cava; </s>
            <s xml:id="echoid-s13646" xml:space="preserve">licèt
              <lb/>
            & </s>
            <s xml:id="echoid-s13647" xml:space="preserve">hicce caſus cum quinto ſequenti ad cavas lentes generali-
              <lb/>
            ter referatur. </s>
            <s xml:id="echoid-s13648" xml:space="preserve">Lens autem cavo-convexa ad cavas aut con-
              <lb/>
            vexas lentes refertur, pro illa aut hac ſuperficie prævalente;</s>
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