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

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          <p>
            <s xml:id="echoid-s14787" xml:space="preserve">
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            & </s>
            <s xml:id="echoid-s14788" xml:space="preserve">figuræ, in vitro depictæ, in plano albo repræſentantur.
              <lb/>
            </s>
            <s xml:id="echoid-s14789" xml:space="preserve">Motu tubi, in quo lentes duæ dantur, detegitur hujus ſitus,
              <lb/>
            ad repræſentationem diſtinctam exhibendam, requiſitus. </s>
            <s xml:id="echoid-s14790" xml:space="preserve">
              <lb/>
            Diſpoſitio autem partium machinæ, quæ immediatè huic
              <lb/>
            ſpectaculo exhibendo inſerviunt, peculiarius eſt explicanda.</s>
            <s xml:id="echoid-s14791" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s14792" xml:space="preserve">Sint hæ partes ſeparatæ; </s>
            <s xml:id="echoid-s14793" xml:space="preserve">S S ſpeculum; </s>
            <s xml:id="echoid-s14794" xml:space="preserve">flamma in l l,
              <lb/>
              <note position="left" xlink:label="note-0582-01" xlink:href="note-0582-01a" xml:space="preserve">838.</note>
            conſtat hæc ex quatuor flammis in lineâ l l; </s>
            <s xml:id="echoid-s14795" xml:space="preserve">V V eſt vitrum
              <lb/>
              <note position="left" xlink:label="note-0582-02" xlink:href="note-0582-02a" xml:space="preserve">TAB. XIV.
                <lb/>
              fig. 2.</note>
            V. </s>
            <s xml:id="echoid-s14796" xml:space="preserve">fig. </s>
            <s xml:id="echoid-s14797" xml:space="preserve">I.</s>
            <s xml:id="echoid-s14798" xml:space="preserve">; O O pictura in vitro plano tenui; </s>
            <s xml:id="echoid-s14799" xml:space="preserve">a a lens major;
              <lb/>
            </s>
            <s xml:id="echoid-s14800" xml:space="preserve">d d lens planior; </s>
            <s xml:id="echoid-s14801" xml:space="preserve">b b annulus ligneus inter lentes; </s>
            <s xml:id="echoid-s14802" xml:space="preserve">f apertura
              <lb/>
            annuli, id eſt, foramen in medio hujus.</s>
            <s xml:id="echoid-s14803" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s14804" xml:space="preserve">Hiſce omnibus ut jam explicatum, & </s>
            <s xml:id="echoid-s14805" xml:space="preserve">ut in hac figurâ vi-
              <lb/>
            detur diſpoſitis; </s>
            <s xml:id="echoid-s14806" xml:space="preserve">radii, qui à puncto picturæ O O procedunt,
              <lb/>
            per lentem a a tranſeundo, minus divergentes ſunt, & </s>
            <s xml:id="echoid-s14807" xml:space="preserve">quaſi
              <lb/>
            à puncto remotiori procederent, ad lentem d d perveniunt
              <note symbol="*" position="left" xlink:label="note-0582-03" xlink:href="note-0582-03a" xml:space="preserve">699.</note>
            ex qua convergentes exeunt , & </s>
            <s xml:id="echoid-s14808" xml:space="preserve">in ſuperficie plani albi
              <note symbol="*" position="left" xlink:label="note-0582-04" xlink:href="note-0582-04a" xml:space="preserve">699.</note>
            liguntur, & </s>
            <s xml:id="echoid-s14809" xml:space="preserve">picturam puncti, figuræ in vitro, exhibent .</s>
            <s xml:id="echoid-s14810" xml:space="preserve">
              <note symbol="*" position="left" xlink:label="note-0582-05" xlink:href="note-0582-05a" xml:space="preserve">711.</note>
            Figura in vitro illuminatur & </s>
            <s xml:id="echoid-s14811" xml:space="preserve">à radiis à flammâ l l proceden-
              <lb/>
            tibus & </s>
            <s xml:id="echoid-s14812" xml:space="preserve">à radiis à ſpeculo S S reflexis.</s>
            <s xml:id="echoid-s14813" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s14814" xml:space="preserve">Ad perfectionem hujus machinæ requiritur; </s>
            <s xml:id="echoid-s14815" xml:space="preserve">1. </s>
            <s xml:id="echoid-s14816" xml:space="preserve">ut figura
              <lb/>
              <note position="left" xlink:label="note-0582-06" xlink:href="note-0582-06a" xml:space="preserve">839.</note>
            O O quantum fieri poteſt ſit illuminata; </s>
            <s xml:id="echoid-s14817" xml:space="preserve">2. </s>
            <s xml:id="echoid-s14818" xml:space="preserve">ut in omnibus
              <lb/>
            punctis æqualiter illuminetur; </s>
            <s xml:id="echoid-s14819" xml:space="preserve">3. </s>
            <s xml:id="echoid-s14820" xml:space="preserve">ut omne lumen, quo ſingu-
              <lb/>
            la picturæ puncta illuminantur, per lentes a a & </s>
            <s xml:id="echoid-s14821" xml:space="preserve">d d ad pla-
              <lb/>
            num album perveniat & </s>
            <s xml:id="echoid-s14822" xml:space="preserve">repræſentationi exhibendæ inſer-
              <lb/>
            viat; </s>
            <s xml:id="echoid-s14823" xml:space="preserve">4. </s>
            <s xml:id="echoid-s14824" xml:space="preserve">tandem ut ſolum hoc lumen ex pixide exeat, ne
              <lb/>
            lumine extraneo minus vivida ſit repræſentatio.</s>
            <s xml:id="echoid-s14825" xml:space="preserve"/>
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          <p>
            <s xml:id="echoid-s14826" xml:space="preserve">A magnitudine flammæ & </s>
            <s xml:id="echoid-s14827" xml:space="preserve">ſpeculi, ut & </s>
            <s xml:id="echoid-s14828" xml:space="preserve">hujus cavitate,
              <lb/>
            pendet requiſitum primum; </s>
            <s xml:id="echoid-s14829" xml:space="preserve">quo magis excavatur ſpeculum,
              <lb/>
            eo propius flammæ admovendum eſt, & </s>
            <s xml:id="echoid-s14830" xml:space="preserve">majori numero
              <lb/>
            radii intercipiuntur, & </s>
            <s xml:id="echoid-s14831" xml:space="preserve">reflectuntur; </s>
            <s xml:id="echoid-s14832" xml:space="preserve">cavendum tamen, ne
              <lb/>
            nimium incaleſcat ſpeculum, quod optimè ex vitro confla-
              <lb/>
            tur.</s>
            <s xml:id="echoid-s14833" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s14834" xml:space="preserve">Datis autem flammâ & </s>
            <s xml:id="echoid-s14835" xml:space="preserve">ſpeculo, ut quantum fieri poteſt
              <lb/>
            maximè illuminetur pictura, & </s>
            <s xml:id="echoid-s14836" xml:space="preserve">ubique æqualiter, ita flamma
              <lb/>
            & </s>
            <s xml:id="echoid-s14837" xml:space="preserve">ſpeculum conſtituuntur, ut repræſentatio inverſa flammæ
              <note symbol="*" position="left" xlink:label="note-0582-07" xlink:href="note-0582-07a" xml:space="preserve">826.</note>
            cadat in ipſam picturam: </s>
            <s xml:id="echoid-s14838" xml:space="preserve">cùm autem repræſentatio flammæ
              <lb/>
            augeri & </s>
            <s xml:id="echoid-s14839" xml:space="preserve">minui poſſit , ita ſpeculum & </s>
            <s xml:id="echoid-s14840" xml:space="preserve">flamma
              <note symbol="*" position="left" xlink:label="note-0582-08" xlink:href="note-0582-08a" xml:space="preserve">826.</note>
            ſunt, ut flammæ repræſentatio totam picturam in vitro </s>
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