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

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        <div xml:id="echoid-div2189" type="section" level="1" n="533">
          <p>
            <s xml:id="echoid-s14591" xml:space="preserve">
              <pb o="(68)" file="0574" n="633" rhead="PHYSICES ELEMENTA"/>
            objecti locum habeat, datur hujus repræſentatio in pariete;
              <lb/>
            </s>
            <s xml:id="echoid-s14592" xml:space="preserve">qui ſi albus fuerit, & </s>
            <s xml:id="echoid-s14593" xml:space="preserve">objectum Solis radiis illuſtratum, vivi-
              <lb/>
            dis coloribus depictum objectum erit.</s>
            <s xml:id="echoid-s14594" xml:space="preserve"/>
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        <div xml:id="echoid-div2196" type="section" level="1" n="534">
          <head xml:id="echoid-head706" xml:space="preserve">
            <emph style="sc">Experimentum</emph>
          3.</head>
          <p>
            <s xml:id="echoid-s14595" xml:space="preserve">In loco obſcuro feneſtra chartâ albâ obtegitur, in cujus
              <lb/>
              <note position="left" xlink:label="note-0574-01" xlink:href="note-0574-01a" xml:space="preserve">TAB. XIII.
                <lb/>
              fig. 4.</note>
            medio foramen datur, cujus diameter ſemi pollicem paulu-
              <lb/>
            lum excedit, & </s>
            <s xml:id="echoid-s14596" xml:space="preserve">quod cum foramine in feneſtrâ congruit, cui
              <lb/>
            ad dìſtantiam ad minimum quinquaginta pedum reſpondent
              <lb/>
            objecta varia à Sole illuminata; </s>
            <s xml:id="echoid-s14597" xml:space="preserve">ſpeculum concavum cujus
              <lb/>
            ſuperficiei diameter eſt quindecim pollicum, & </s>
            <s xml:id="echoid-s14598" xml:space="preserve">quod ad di-
              <lb/>
            ſtantiam octodecim pollicum colligit radios parallelos, ad
              <lb/>
            hanc diſtantiam à feneſtrâ diſponitur ita, ut linea, per cen-
              <lb/>
            trum foraminis, & </s>
            <s xml:id="echoid-s14599" xml:space="preserve">centrum ſuperficiei ſpeculi tranſiens, ad
              <lb/>
            planum chartæ, & </s>
            <s xml:id="echoid-s14600" xml:space="preserve">ſpeculi ſuperficiem perpendicularis ſit.
              <lb/>
            </s>
            <s xml:id="echoid-s14601" xml:space="preserve">Objecta tunc ſuper chartâ repræſentantur in circulo concen-
              <lb/>
            trico cum foramine, & </s>
            <s xml:id="echoid-s14602" xml:space="preserve">cujus diameter æqualis eſt diametro
              <lb/>
            ſpeculi. </s>
            <s xml:id="echoid-s14603" xml:space="preserve">Conus truncatus excavatus cum foramine extra
              <lb/>
            cubiculum jungitur ad excludendum lumen, quod non ab
              <lb/>
            objectis repræſentandis advenit.</s>
            <s xml:id="echoid-s14604" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s14605" xml:space="preserve">Sit ſpeculum cavum b e; </s>
            <s xml:id="echoid-s14606" xml:space="preserve">centrum cavitatis C; </s>
            <s xml:id="echoid-s14607" xml:space="preserve">punctum
              <lb/>
              <note position="left" xlink:label="note-0574-02" xlink:href="note-0574-02a" xml:space="preserve">818.</note>
            radians A, ultra centrum C à ſpeculo diſtans; </s>
            <s xml:id="echoid-s14608" xml:space="preserve">radii inci-
              <lb/>
              <note position="left" xlink:label="note-0574-03" xlink:href="note-0574-03a" xml:space="preserve">TAB. XIII.
                <lb/>
              fig. 5.</note>
            dentes A b, A d, A e, quorum reflexi b f, dg, eb, cum
              <lb/>
            intermediis, mutuis interſectionibus, formant curvam a a,
              <lb/>
            quam omnes tangunt; </s>
            <s xml:id="echoid-s14609" xml:space="preserve">Punctum ideo A in hac curvâ appa-
              <lb/>
            ret , & </s>
            <s xml:id="echoid-s14610" xml:space="preserve">moto oculo in plano curvæ apparentia per
              <note symbol="*" position="left" xlink:label="note-0574-04" xlink:href="note-0574-04a" xml:space="preserve">808.</note>
            curvam transfertur. </s>
            <s xml:id="echoid-s14611" xml:space="preserve">In ſingulis autem planis quæ per C A
              <lb/>
            concipi poſſunt talis datur curva, omnes concurrunt in linea
              <lb/>
            C A, nempe in a. </s>
            <s xml:id="echoid-s14612" xml:space="preserve">In hoc puncto a ergo maximâ copiâ col-
              <lb/>
              <note position="left" xlink:label="note-0574-05" xlink:href="note-0574-05a" xml:space="preserve">819.</note>
            liguntur radii reflexi, quod ideò vocatur focus radiorum ex
              <lb/>
            A profluentium. </s>
            <s xml:id="echoid-s14613" xml:space="preserve">Vice verſa A eſt focus, poſito radiante
              <lb/>
            in a .</s>
            <s xml:id="echoid-s14614" xml:space="preserve"/>
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          <note symbol="*" position="left" xml:space="preserve">785.</note>
          <p>
            <s xml:id="echoid-s14615" xml:space="preserve">In hac figura pars curvæ, quæ ab unâ parte lineæ A C
              <lb/>
            datur, tantum delineata eſt; </s>
            <s xml:id="echoid-s14616" xml:space="preserve">pars ſimilis ad aliam partem
              <lb/>
            concipi debet; </s>
            <s xml:id="echoid-s14617" xml:space="preserve">ambæ junguntur in foco puncti radiantis.</s>
            <s xml:id="echoid-s14618" xml:space="preserve"/>
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          <p>
            <s xml:id="echoid-s14619" xml:space="preserve">Recedente puncto radiante ad ſpeculum accedit curva.</s>
            <s xml:id="echoid-s14620" xml:space="preserve"/>
          </p>
          <note position="left" xml:space="preserve">820.</note>
          <p>
            <s xml:id="echoid-s14621" xml:space="preserve">Accedente radiante recedit à ſpeculo curva & </s>
            <s xml:id="echoid-s14622" xml:space="preserve">verſus
              <lb/>
            ipſum radians movetur; </s>
            <s xml:id="echoid-s14623" xml:space="preserve">donec in centro C concurrant; </s>
            <s xml:id="echoid-s14624" xml:space="preserve">in
              <lb/>
              <note position="left" xlink:label="note-0574-08" xlink:href="note-0574-08a" xml:space="preserve">821.</note>
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