Bernstein, Aaron, Naturwissenschaftliche Volksbücher, Bd. 12-16, 1897

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        <div xml:id="echoid-div79" type="section" level="1" n="72">
          <p>
            <s xml:id="echoid-s3029" xml:space="preserve">
              <pb o="100" file="0232" n="232"/>
            zeugen; </s>
            <s xml:id="echoid-s3030" xml:space="preserve">zu dieſem Zweck ſetzen wir hier drei ſchwarze Punkte
              <lb/>
            her; </s>
            <s xml:id="echoid-s3031" xml:space="preserve">die wir durch a, b und c bezeichnen:</s>
            <s xml:id="echoid-s3032" xml:space="preserve"/>
          </p>
          <figure number="11">
            <variables xml:id="echoid-variables7" xml:space="preserve">a b c</variables>
          </figure>
          <p>
            <s xml:id="echoid-s3033" xml:space="preserve">Der Leſer ſchließe das linke Auge und blicke mit dem
              <lb/>
            rechten Auge von ferne auf den Punkt a; </s>
            <s xml:id="echoid-s3034" xml:space="preserve">er wird nicht nur
              <lb/>
            dieſen, ſondern auch, ohne den Blick von a abzuwenden, die
              <lb/>
            beiden andern Punkte ſehen; </s>
            <s xml:id="echoid-s3035" xml:space="preserve">nun aber bringe man das Buch
              <lb/>
            dem Auge langſam näher, wobei man ſtets nur auf den Punkt
              <lb/>
            a direkt ſieht, und man wird bald bemerken, daß der Punkt c
              <lb/>
            unſichtbar wird. </s>
            <s xml:id="echoid-s3036" xml:space="preserve">Fährt man fort, das Buch dem Auge zu
              <lb/>
            nähern, ſo wird der Punkt c wieder ſichtbar, während bald
              <lb/>
            bei weiterem Nähern der Punkt b verſchwindet. </s>
            <s xml:id="echoid-s3037" xml:space="preserve">— Will man
              <lb/>
            den Verſuch mit dem linken Auge machen, ſo muß man das
              <lb/>
            rechte ſchließen, und den Blick auf den Punkt c, ſtatt auf den
              <lb/>
            Punkt a richten, und man wird dieſelben Erſcheinungen haben.</s>
            <s xml:id="echoid-s3038" xml:space="preserve"/>
          </p>
          <figure number="12">
            <caption xml:id="echoid-caption8" xml:space="preserve">Fig. 7.</caption>
          </figure>
          <p>
            <s xml:id="echoid-s3039" xml:space="preserve">Für Manche wird der Verſuch mit den drei Punkten die
              <lb/>
            beſchriebene Erſcheinung bequem demonſtrieren, Andere werden
              <lb/>
            diesbezüglich beſſer durch Benutzung der Fig. </s>
            <s xml:id="echoid-s3040" xml:space="preserve">7 fahren, bei der
              <lb/>
            das kleine Kreuz mit dem rechten Auge nach Schluß des linken
              <lb/>
            anzublicken iſt: </s>
            <s xml:id="echoid-s3041" xml:space="preserve">das Verſchwinden des mächtigen, ſchwarzen
              <lb/>
            Fleckes, ſobald die Entfernung des Auges etwa 20 cm beträgt,
              <lb/>
            iſt hier höchſt auffallend.</s>
            <s xml:id="echoid-s3042" xml:space="preserve"/>
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