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

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          <p>
            <s xml:id="echoid-s2375" xml:space="preserve">
              <pb o="49" file="0181" n="181"/>
            befindet. </s>
            <s xml:id="echoid-s2376" xml:space="preserve">Mit anderen Worten: </s>
            <s xml:id="echoid-s2377" xml:space="preserve">auf der matten Scheibe einer
              <lb/>
            Kamera-Obſcura überblickt man lange nicht ſo viel nach allen
              <lb/>
            Seiten, wie man mit dem Auge überblickt, ſelbſt wenn man es
              <lb/>
            nicht dreht. </s>
            <s xml:id="echoid-s2378" xml:space="preserve">— Wir werden alſo auch hierin ſehen, wie die
              <lb/>
            Kamera-Obſcura, die wir zur Welt mitbringen, vorteilhafter
              <lb/>
            gebaut iſt, als unſer ſchwaches Kunſtwerk.</s>
            <s xml:id="echoid-s2379" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s2380" xml:space="preserve">Endlich müſſen wir noch einen Mangel kennen lernen!</s>
          </p>
          <p>
            <s xml:id="echoid-s2381" xml:space="preserve">Bei wiederholten Verſuchen mit der von uns fabrizierten
              <lb/>
            Kamera wird man finden, daß, ſelbſt wenn man hierzu eine
              <lb/>
            ſehr akkurat geſchliffene, feine Linſe genommen hat, ſelbſt wenn
              <lb/>
            man den Rand der Linſe, der ſtörende Lichtſtrahlen durchläßt,
              <lb/>
            belegt hat, ſelbſt wenn man ſich all’ der Vorteile bedient, die
              <lb/>
            ſeither erfunden worden ſind, doch noch ein Übel nicht gehoben
              <lb/>
            iſt, und das iſt die Farbenbrechung. </s>
            <s xml:id="echoid-s2382" xml:space="preserve">Um dieſen Fehler genau
              <lb/>
            zu erkennen, dazu gehört ſchon eine gewiſſe Übung; </s>
            <s xml:id="echoid-s2383" xml:space="preserve">hat man
              <lb/>
            aber dieſe erworben, ſo nimmt man wahr, daß eine einfache
              <lb/>
            Linſe Alles, was ſie zeigt, mit feinen Rändern von Regen-
              <lb/>
            bogenfarben zeigt, die zwar als Spielerei gar nicht unange-
              <lb/>
            nehm ſind, aber der Deutlichkeit der Bilder außerordentlich
              <lb/>
            ſchaden.</s>
            <s xml:id="echoid-s2384" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s2385" xml:space="preserve">Der Grund dieſer Erſcheinung iſt ebenfalls in der Lehre
              <lb/>
            vom Licht, und zwar in der Lehre von den Farben des Lichtes,
              <lb/>
            ſehr genau und ſcharf angegeben, und deshalb hat man auch
              <lb/>
            nach vielem Sinnen und Trachten und nach einer ſehr glück-
              <lb/>
            lichen Entdeckung dieſen Fehler dadurch vermeiden gelernt, daß
              <lb/>
            man in einer ordentlichen Kamera-Obſcura ſtatt einer Linſe
              <lb/>
            zwei Linſen von verſchiedenen Glasſorten anbringt, wodurch die
              <lb/>
            farbigen Ränder der Bilder vermieden werden können. </s>
            <s xml:id="echoid-s2386" xml:space="preserve">Aus
              <lb/>
            gleichem Grunde verſieht man jetzt alle Fernröhre und gute
              <lb/>
            Mikroſkope mit ſolchen Doppellinſen. </s>
            <s xml:id="echoid-s2387" xml:space="preserve">— Für unſer Thema
              <lb/>
            wollen wir uns dies nur inſofern merken, als wir recht bald bei
              <lb/>
            der Kamera-Obſcura, die wir zur Welt mitbringen, ſehen
              <lb/>
            werden, wie der Fehler der Farbenränder auch am Auge </s>
          </p>
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