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

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        <div xml:id="echoid-div2270" type="section" level="1" n="559">
          <p>
            <s xml:id="echoid-s15134" xml:space="preserve">
              <pb o="(85)" file="0597" n="659" rhead="MATHEMATICA LIB. III. CAP. XIX."/>
            do: </s>
            <s xml:id="echoid-s15135" xml:space="preserve">ita, ut hæc longitudo ſola conſideranda ſit in determi-
              <lb/>
            nandis colorum limitibus, in ipſâ imagine, hi in hac figurâ
              <lb/>
            litteris a, b, c, d, e, f, g, h, notantur, & </s>
            <s xml:id="echoid-s15136" xml:space="preserve">numerus uni-
              <lb/>
            cuique colori adſcriptus ſpatium ab hoc in imagine occupa-
              <lb/>
            tum deſignat, diviſâ totâ imaginis longitudine in partes 360.</s>
            <s xml:id="echoid-s15137" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s15138" xml:space="preserve">Si latitudo imaginis Solis oblonga minuatur, magis in i-
              <lb/>
              <note position="right" xlink:label="note-0597-01" xlink:href="note-0597-01a" xml:space="preserve">862.</note>
            magine colores heterogenei ſeparantur, quia in ſingulis pun-
              <lb/>
            ctis minori numero confunduntur imagines peculiares, ex
              <lb/>
            radiis variarum refrangibilitatum parum inter ſe differentium.</s>
            <s xml:id="echoid-s15139" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s15140" xml:space="preserve">Color cujuſcunque radii, ut & </s>
            <s xml:id="echoid-s15141" xml:space="preserve">hujus refrangibilitas, nul-
              <lb/>
              <note position="right" xlink:label="note-0597-02" xlink:href="note-0597-02a" xml:space="preserve">863.</note>
            lis refractionibus, neque reflexionibus, aut per mixtionibus
              <lb/>
            quibuſcunque mutatur.</s>
            <s xml:id="echoid-s15142" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s15143" xml:space="preserve">De refractione & </s>
            <s xml:id="echoid-s15144" xml:space="preserve">reflectione in hoc capite, de permixtio-
              <lb/>
            ne in ſequenti, agam.</s>
            <s xml:id="echoid-s15145" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s15146" xml:space="preserve">Refrangibilitatem refractione non mutari in exp. </s>
            <s xml:id="echoid-s15147" xml:space="preserve">5. </s>
            <s xml:id="echoid-s15148" xml:space="preserve">cap.
              <lb/>
            </s>
            <s xml:id="echoid-s15149" xml:space="preserve">
              <note position="right" xlink:label="note-0597-03" xlink:href="note-0597-03a" xml:space="preserve">864.</note>
            præcedentis probatur; </s>
            <s xml:id="echoid-s15150" xml:space="preserve">quod & </s>
            <s xml:id="echoid-s15151" xml:space="preserve">etiam ad colorem referri po-
              <lb/>
            teſt; </s>
            <s xml:id="echoid-s15152" xml:space="preserve">hæc eadem experimento ſequenti clariùs evincuntur.
              <lb/>
            </s>
            <s xml:id="echoid-s15153" xml:space="preserve">Circa quod notandum, quod & </s>
            <s xml:id="echoid-s15154" xml:space="preserve">de ſequentibus etiam dicen-
              <lb/>
            dum eſt, experimenta inſtituenda eſſe cum priſmatibus ex
              <lb/>
            vitro puro venulis immune, his enim irregulariter lumen in
              <lb/>
            priſmate movetur & </s>
            <s xml:id="echoid-s15155" xml:space="preserve">radii refractionibus non ritè ſeparantur.</s>
            <s xml:id="echoid-s15156" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div2276" type="section" level="1" n="560">
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            <emph style="sc">Experimentum</emph>
          1.</head>
          <p>
            <s xml:id="echoid-s15157" xml:space="preserve">Rebus diſpoſitis ut in exp. </s>
            <s xml:id="echoid-s15158" xml:space="preserve">1. </s>
            <s xml:id="echoid-s15159" xml:space="preserve">capitis præcedentis, inſti-
              <lb/>
              <note position="right" xlink:label="note-0597-04" xlink:href="note-0597-04a" xml:space="preserve">TAB. XVI.
                <lb/>
              fig. 2.</note>
            tuitur experimentum cum radio ſolari per foramen intrante,
              <lb/>
            cujus diameter eſt ſemi pollicis; </s>
            <s xml:id="echoid-s15160" xml:space="preserve">ſuſtentaculum autem S
              <lb/>
            priſmatis tale eſt, ut inter latera moveatur tabella t, quæ in
              <lb/>
            hoc experimento uſu venit, in hac datur foramen F diame-
              <lb/>
            tri octavæ partis unius pollicis, per hoc tranſmittitur lumen
              <lb/>
            à priſmate refractum, quo radii in oblongâ imagine melius
              <lb/>
            inter ſe ſeparantur, radiis magnâ parte interceptis; </s>
            <s xml:id="echoid-s15161" xml:space="preserve">imago
              <lb/>
            hæc oblonga RV, ad diſtantiam decem aut duodecim pe-
              <lb/>
            dum à priſmate, cadit in tabellam t, ſuſtentaculi ſimilis
              <lb/>
            priori, in quâ tabellâ etiam exiguum, ut in primâ, datur
              <lb/>
            foramen F; </s>
            <s xml:id="echoid-s15162" xml:space="preserve">per quod radii tranſeunt, qui in ſecundum ca-
              <lb/>
            dunt priſma, huic ſuſtentaculo impoſitum, & </s>
            <s xml:id="echoid-s15163" xml:space="preserve">refringuntur
              <lb/>
            eodem modo ac per primum; </s>
            <s xml:id="echoid-s15164" xml:space="preserve">paululum circa axem agitan-
              <lb/>
            do primum priſma, adſcendit aut deſcendit imago RV, </s>
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