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

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            <s xml:id="echoid-s15692" xml:space="preserve">
              <pb o="(100)" file="0616" n="680" rhead="PHYSICES ELEMENTA"/>
            queâ in bullâ, quarum craſſities recedendoà medio creſcunt,
              <lb/>
            eodem ordine colores diſponuntur. </s>
            <s xml:id="echoid-s15693" xml:space="preserve">In laminâ tamen den-
              <lb/>
              <note position="left" xlink:label="note-0616-01" xlink:href="note-0616-01a" xml:space="preserve">889.</note>
            ſiori minor craſſities requiritur, quàm in rariori, ut eodem
              <lb/>
            colore tingantur.</s>
            <s xml:id="echoid-s15694" xml:space="preserve"/>
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        </div>
        <div xml:id="echoid-div2344" type="section" level="1" n="587">
          <head xml:id="echoid-head769" xml:space="preserve">
            <emph style="sc">Experimentum</emph>
          3.</head>
          <p>
            <s xml:id="echoid-s15695" xml:space="preserve">Iiſdem poſitis quæ in Experimento 1.</s>
            <s xml:id="echoid-s15696" xml:space="preserve">; madefactis paulu-
              <lb/>
            lum ab unâ parte vitrorum marginibus, aqua paulatim inter
              <lb/>
            vitra penetrabit; </s>
            <s xml:id="echoid-s15697" xml:space="preserve">in aquâ non alii, quàm in aëre, circulorum
              <lb/>
            colores obſervantur, neque horum ordo mutatur, ſed circuli
              <lb/>
            contrahuntur; </s>
            <s xml:id="echoid-s15698" xml:space="preserve">ubi ad centrum pervenit aqua, omnes circu-
              <lb/>
            lorum portiones in aquâ à portionìbus in aëre ſeparantur, & </s>
            <s xml:id="echoid-s15699" xml:space="preserve">
              <lb/>
            in minus ſpatium rediguntur.</s>
            <s xml:id="echoid-s15700" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s15701" xml:space="preserve">Laminæ color ab illius craſſitie , & </s>
            <s xml:id="echoid-s15702" xml:space="preserve">denſitate ,
              <note position="left" xlink:label="note-0616-02" xlink:href="note-0616-02a" xml:space="preserve">890.</note>
              <note symbol="*" position="left" xlink:label="note-0616-03" xlink:href="note-0616-03a" xml:space="preserve">887.</note>
              <note symbol="*" position="left" xlink:label="note-0616-04" xlink:href="note-0616-04a" xml:space="preserve">889.</note>
            det, non à medio circumdante.</s>
            <s xml:id="echoid-s15703" xml:space="preserve"/>
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        </div>
        <div xml:id="echoid-div2346" type="section" level="1" n="588">
          <head xml:id="echoid-head770" xml:space="preserve">
            <emph style="sc">Experimentum</emph>
          4.</head>
          <p>
            <s xml:id="echoid-s15704" xml:space="preserve">Si lamella ex lapide ſpeculari ita tenuis detur, ut colorata
              <lb/>
            appareat, colores non mutantur ſi madefacta fuerit, id eſt,
              <lb/>
            ſi, loco aëris, aquâ circumdetur lamella.</s>
            <s xml:id="echoid-s15705" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s15706" xml:space="preserve">Ejuſdem lamellæ color eſt eo magis vividus, quo illius denſitas
              <lb/>
              <note position="left" xlink:label="note-0616-05" xlink:href="note-0616-05a" xml:space="preserve">891.</note>
            magis differt cum denſitate medii circumambientis. </s>
            <s xml:id="echoid-s15707" xml:space="preserve">Hoc præ-
              <lb/>
            cedenti Experimento probatur, in quo colores laminæ made-
              <lb/>
            factæ languidiores ſunt, quàm laminæ aëre circumdatæ. </s>
            <s xml:id="echoid-s15708" xml:space="preserve">Etiam
              <lb/>
            in Exp. </s>
            <s xml:id="echoid-s15709" xml:space="preserve">3. </s>
            <s xml:id="echoid-s15710" xml:space="preserve">minus vividi ſunt colores quàm in ſecundo; </s>
            <s xml:id="echoid-s15711" xml:space="preserve">in utroque
              <lb/>
            lamina aquea datur, in hoc aëre, in illo vitro circumdata; </s>
            <s xml:id="echoid-s15712" xml:space="preserve">minus
              <lb/>
            autem aqua & </s>
            <s xml:id="echoid-s15713" xml:space="preserve">vitrum denſitate differunt, quàm aër & </s>
            <s xml:id="echoid-s15714" xml:space="preserve">aqua.</s>
            <s xml:id="echoid-s15715" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s15716" xml:space="preserve">Si media denſitate æqualiter differant, colores vividiores
              <lb/>
              <note position="left" xlink:label="note-0616-06" xlink:href="note-0616-06a" xml:space="preserve">892.</note>
            erunt, ſi denſius rariori circumdetur: </s>
            <s xml:id="echoid-s15717" xml:space="preserve">nam in laminâ vitreâ
              <lb/>
            tenuiſſimâ, quæ coloribus ex tenuitate tingitur, aëre circum-
              <lb/>
            datâ, colores magis vividi erunt, quàm in Exper. </s>
            <s xml:id="echoid-s15718" xml:space="preserve">1. </s>
            <s xml:id="echoid-s15719" xml:space="preserve">in quo
              <lb/>
            lamina aërea vitro circumdatur.</s>
            <s xml:id="echoid-s15720" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s15721" xml:space="preserve">Ejuſdem denſitatis lamina, eodem medio circumdata, eo
              <lb/>
              <note position="left" xlink:label="note-0616-07" xlink:href="note-0616-07a" xml:space="preserve">893.</note>
            majori copiâ lumen reflectit, quo tenuior eſt. </s>
            <s xml:id="echoid-s15722" xml:space="preserve">Nimium tamen
              <lb/>
              <note position="left" xlink:label="note-0616-08" xlink:href="note-0616-08a" xml:space="preserve">894.</note>
            ſi minuatur craſſities, non reflectit lumen. </s>
            <s xml:id="echoid-s15723" xml:space="preserve">Patent hæc expe-
              <lb/>
            rimentis præcedentibus; </s>
            <s xml:id="echoid-s15724" xml:space="preserve">in tribus primis circuli colorati mi-
              <lb/>
            nores, qui etiam ſunt tenuiores, omnium optimè lumen re-
              <lb/>
            flectunt; </s>
            <s xml:id="echoid-s15725" xml:space="preserve">in centro verò, ubi lamina eſt omnium tenuiſſi-
              <lb/>
            ma, nulla ſenſibilis datur reflectio; </s>
            <s xml:id="echoid-s15726" xml:space="preserve">ut illud in ſecundo </s>
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