Bernstein, Aaron, Naturwissenschaftliche Volksbücher, Bd. 17-21, 1897

Table of figures

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[111] Fig. 12.e g c b a
[112] Fig. 13.
[113] Fig. 14.f f f n. n. B B i i
[114] Fig. 15.M H A C E N G
[115] Fig. 16.
[116] Fig. 17.M F N
[117] Fig. 18.m f’ e’ d’ c’ b’ e f a P na b c d e f
[118] Fig. 20.n n n n n n n n n n n
[119] Fig. 19.E n y m m
[120] Fig. 21.n n m b f a a a a c g m o o b h r z y q o
[121] Fig. 22.
[122] Fig. 23.
[123] Fig. 24.A B D
[124] Fig. 25.A B C D E F
[125] Fig. 26.
[Figure 126]
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            <s xml:id="echoid-s5931" xml:space="preserve">
              <pb o="75" file="493" n="493"/>
            Boden. </s>
            <s xml:id="echoid-s5932" xml:space="preserve">Beide Teile ſind ſo aneinander gefügt, daß die Lampe
              <lb/>
            in demjenigen Punkte ſteht, der beiden Teilen zum gemein-
              <lb/>
            ſchaftlichen Brennpunkte dient, die Laterne leuchtet alſo nach
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            zwei verſchiedenen Seiten. </s>
            <s xml:id="echoid-s5933" xml:space="preserve">Was nun an dieſer Beleuchtungs-
              <lb/>
            art unzweckmäßig für die Straße iſt, das iſt ſehr zweckmäßig
              <lb/>
            für den Leuchtturm. </s>
            <s xml:id="echoid-s5934" xml:space="preserve">Dieſer ſoll ja nicht die See beleuchten,
              <lb/>
              <figure xlink:label="fig-493-01" xlink:href="fig-493-01a" number="115">
                <caption xml:id="echoid-caption110" xml:space="preserve">Fig. 16.</caption>
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            ſo daß man ſeinen Pfad darauf
              <lb/>
            finden kann, — da giebt es keine
              <lb/>
            betretenen Fußſteige, keine befahrenen
              <lb/>
            Chauſſeen, die man in dem Lichte
              <lb/>
            des Leuchtturmes ſucht, der Kompaß
              <lb/>
            iſt die Laterne, und die Seekarte
              <lb/>
            zeigt den Weg, den der geſchickte
              <lb/>
            Kapitän in dunkelſter Nacht findet,
              <lb/>
            — der nahende Schiffer ſoll den
              <lb/>
            Turm nur ſehen, er ſoll ihm Kunde
              <lb/>
            geben, daß dort Land, vielleicht auch,
              <lb/>
            daß dort Gefahr oder umgekehrt,
              <lb/>
            daß dort Sicherheit ſei, ein Hafen,
              <lb/>
            in welchen er einlaufen könne, und
              <lb/>
            er ſoll ihm auch womöglich zeigen,
              <lb/>
            in welcher Gegend, an was für einer
              <lb/>
            Küſte er ſei, aber den Weg beleuchten
              <lb/>
            ſoll er nicht.</s>
            <s xml:id="echoid-s5935" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5936" xml:space="preserve">Dieſe Dinge alle werden erreicht, indem man eine oder
              <lb/>
            mehrere Lampen von größtmöglicher Wirkung in den Brenn-
              <lb/>
            punkt eines oder mehrerer paraboliſcher Brennſpiegel ſetzt und
              <lb/>
            dieſe ſo ſtellt, daß ſie die Strahlen ſo weit wie irgend möglich
              <lb/>
            ſenden.</s>
            <s xml:id="echoid-s5937" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5938" xml:space="preserve">Bei Leuchttürmen bedient man ſich gewöhnlich mehrerer
              <lb/>
            Lampen (eine kommt nicht häufig vor), und die Lampen ſind
              <lb/>
            von beſonderer Art. </s>
            <s xml:id="echoid-s5939" xml:space="preserve">Bekanntlich verdankt die Argand’ſche
              <lb/>
            Lampe ihre außerordentliche Wirkung dem Umſtande, daß </s>
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