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

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            <s xml:id="echoid-s15829" xml:space="preserve">
              <pb o="(103)" file="0619" n="683" rhead="MATHEMATICA LIB. III. CAP. XXIII."/>
            id eſt, in hcc motu oculi laminæ color in determinato loco
              <lb/>
            mutatur: </s>
            <s xml:id="echoid-s15830" xml:space="preserve">major tamen eſt in Exp. </s>
            <s xml:id="echoid-s15831" xml:space="preserve">1. </s>
            <s xml:id="echoid-s15832" xml:space="preserve">dilatatio; </s>
            <s xml:id="echoid-s15833" xml:space="preserve">quod pro-
              <lb/>
            bat obliquitate radiorum colorem magis mutari, ſilamina den-
              <lb/>
              <note position="right" xlink:label="note-0619-01" xlink:href="note-0619-01a" xml:space="preserve">902.</note>
            ſiori medio, quàm ſi rariori circumdetur.</s>
            <s xml:id="echoid-s15834" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s15835" xml:space="preserve">Cujus propoſitionis demonſtrationem ex refractionis legi-
              <lb/>
              <note position="right" xlink:label="note-0619-02" xlink:href="note-0619-02a" xml:space="preserve">TAB. XVIII.
                <lb/>
              fig. 7.</note>
            bus facile deducimus. </s>
            <s xml:id="echoid-s15836" xml:space="preserve">Sint L & </s>
            <s xml:id="echoid-s15837" xml:space="preserve">l laminæ tenues; </s>
            <s xml:id="echoid-s15838" xml:space="preserve">hæc me-
              <lb/>
            dio denſiori, illa medio rariori circumdata; </s>
            <s xml:id="echoid-s15839" xml:space="preserve">ſint ambæ ejuſ-
              <lb/>
            dem craſſitiei: </s>
            <s xml:id="echoid-s15840" xml:space="preserve">ſi in has incidant radii AB, ab, æqualiter
              <lb/>
            ad laminas inclinati; </s>
            <s xml:id="echoid-s15841" xml:space="preserve">in L refractio fiet, accedendo ad per-
              <lb/>
            pendicularem ; </s>
            <s xml:id="echoid-s15842" xml:space="preserve">in l contra refringitur radius recedendo
              <note symbol="*" position="right" xlink:label="note-0619-03" xlink:href="note-0619-03a" xml:space="preserve">624.</note>
            perpendiculari ; </s>
            <s xml:id="echoid-s15843" xml:space="preserve">& </s>
            <s xml:id="echoid-s15844" xml:space="preserve">licèt BD & </s>
            <s xml:id="echoid-s15845" xml:space="preserve">bd ſint æquales, bc
              <note symbol="*" position="right" xlink:label="note-0619-04" xlink:href="note-0619-04a" xml:space="preserve">625.</note>
            ne ſuperat BC, ideòque major datur mutatio in motu lu-
              <lb/>
            minis in laminâ l quàm in L. </s>
            <s xml:id="echoid-s15846" xml:space="preserve">Auctâ denſitate laminæ L,
              <lb/>
              <note position="right" xlink:label="note-0619-05" xlink:href="note-0619-05a" xml:space="preserve">903.</note>
            manente medio rariori quo circumdatur, minor dabitur diffe-
              <lb/>
            rentia inter BC & </s>
            <s xml:id="echoid-s15847" xml:space="preserve">BD, ideoque minor mutatio coloris; </s>
            <s xml:id="echoid-s15848" xml:space="preserve">& </s>
            <s xml:id="echoid-s15849" xml:space="preserve">
              <lb/>
            ſi ita augeatur vis refringens laminæ, ut radii refracti, quæ-
              <lb/>
              <note position="right" xlink:label="note-0619-06" xlink:href="note-0619-06a" xml:space="preserve">904.</note>
            cunque fuerit incidentis obliquitas, ſenſibiliter inter ſe non
              <lb/>
            differant, ſenſibilis non dabitur differentia in colore laminæ,
              <lb/>
            in quocunque ſitu oculus ponatur.</s>
            <s xml:id="echoid-s15850" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s15851" xml:space="preserve">Ex hiſce facile deducimus, quarundam laminarum colorem
              <lb/>
              <note position="right" xlink:label="note-0619-07" xlink:href="note-0619-07a" xml:space="preserve">905.</note>
            ex mutato oculi ſitu variari, aliarum colorem permanere.</s>
            <s xml:id="echoid-s15852" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div2362" type="section" level="1" n="591">
          <head xml:id="echoid-head773" xml:space="preserve">CAPUT XXIII.
            <lb/>
          De Corporum naturalium Coloribus.</head>
          <p>
            <s xml:id="echoid-s15853" xml:space="preserve">QUæ Corporum quorumcunque colores ſpectant, ex huc
              <lb/>
            uſque explicatis facilè deducuntur.</s>
            <s xml:id="echoid-s15854" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s15855" xml:space="preserve">Vidimus radios luminis colores ſibi peculiares & </s>
            <s xml:id="echoid-s15856" xml:space="preserve">im-
              <lb/>
            mutabiles habere, ita ut reflectione non mutentur .</s>
            <s xml:id="echoid-s15857" xml:space="preserve">
              <note symbol="*" position="right" xlink:label="note-0619-08" xlink:href="note-0619-08a" xml:space="preserve">863.</note>
            </s>
          </p>
          <p style="it">
            <s xml:id="echoid-s15858" xml:space="preserve">Ideò radii à corporibus reflexi, pro majori aut minori re-
              <lb/>
              <note position="right" xlink:label="note-0619-09" xlink:href="note-0619-09a" xml:space="preserve">906.</note>
            frangibilitate, quæ competit colori ipſius corporis, majorem
              <lb/>
            aut minorem refrangibilitatem habent.</s>
            <s xml:id="echoid-s15859" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div2365" type="section" level="1" n="592">
          <head xml:id="echoid-head774" xml:space="preserve">
            <emph style="sc">Experimentum</emph>
          1.</head>
          <p>
            <s xml:id="echoid-s15860" xml:space="preserve">In medio chartæ nigræ duo fruſta quadrata, duorum cir-
              <lb/>
            citer pollicum, vittæ ſericæ, unum rubeum alterum viola-
              <lb/>
            ceum, junguntur ita, ut ſeſe mutuo ad latera tangant, eo-
              <lb/>
            dem modo ac colores ruber & </s>
            <s xml:id="echoid-s15861" xml:space="preserve">violaceus in Exp. </s>
            <s xml:id="echoid-s15862" xml:space="preserve">3. </s>
            <s xml:id="echoid-s15863" xml:space="preserve">cap. </s>
            <s xml:id="echoid-s15864" xml:space="preserve">19.</s>
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