Bernstein, Aaron, Naturwissenschaftliche Volksbücher, Bd. 1/5, 1897

Table of handwritten notes

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            <s xml:id="echoid-s1163" xml:space="preserve">
              <pb o="84" file="094" n="94"/>
            fallen. </s>
            <s xml:id="echoid-s1164" xml:space="preserve">Wenn nun aber die aufſteigenden Luftſtröme ſich in
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            den oberen Regionen allmählich abkühlen, ſo können ſie nicht
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            mehr ſo viel Waſſerdampf aufgelöſt in ſich enthalten, als ſie
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            es bei der höheren Temperatur am Erdboden vermochten: </s>
            <s xml:id="echoid-s1165" xml:space="preserve">der
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            Waſſerdampf, bis dahin unſichtbar, “kondenſiert” ſich, bildet
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            Wolken und fällt bei noch ſtärkerer Abkühlung als Regen
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            heraus. </s>
            <s xml:id="echoid-s1166" xml:space="preserve">Daher kommt es, daß bei fallendem Barometer ſo
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            oft Regen eintritt; </s>
            <s xml:id="echoid-s1167" xml:space="preserve">man ſieht aber auch gleichzeitig, daß das
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            Fallen des Barometers und der Regenguß nur zufällige Begleit-
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            erſcheinungen ſind, daß ſie an und für ſich nichts mit einander
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            zu thun haben. </s>
            <s xml:id="echoid-s1168" xml:space="preserve">Enthält der aufſteigende Luftſtrom wenig
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            Waſſerdampf, ſo kann das Barometer fallen, ohne daß Wolken-
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            bildung und Regenfall ſtattfinden. </s>
            <s xml:id="echoid-s1169" xml:space="preserve">Das Barometer kann dabei
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            auf “Regen” deuten und doch bleibt das Wetter ſchön; </s>
            <s xml:id="echoid-s1170" xml:space="preserve">hat
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            aber deshalb das Barometer “falſch gezeigt”? </s>
            <s xml:id="echoid-s1171" xml:space="preserve">Keineswegs.
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            </s>
            <s xml:id="echoid-s1172" xml:space="preserve">Falſch doch nur inſofern, als die dem Barometer meiſt bei-
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            gefügten Angaben “Beſtändig”, “Schön”, “Veränderlich”,
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            “Regen”, “Sturm” u. </s>
            <s xml:id="echoid-s1173" xml:space="preserve">ſ. </s>
            <s xml:id="echoid-s1174" xml:space="preserve">w. </s>
            <s xml:id="echoid-s1175" xml:space="preserve">keineswegs zutreffend zu ſein
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            brauchen, ſondern
              <emph style="sp">willkürlich</emph>
            dem Barometer vom Verfertiger
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            hinzugefügt wurden.</s>
            <s xml:id="echoid-s1176" xml:space="preserve"/>
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            <s xml:id="echoid-s1177" xml:space="preserve">Und wie kommt ein Steigen des Luftdrucks zuſtande?
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            </s>
            <s xml:id="echoid-s1178" xml:space="preserve">Nun, wenn im Winter z. </s>
            <s xml:id="echoid-s1179" xml:space="preserve">B. </s>
            <s xml:id="echoid-s1180" xml:space="preserve">eine ſtarke Abkühlung der Erd-
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            oberfläche ſtattfindet, durch Ausſtrahlung in klaren Nächten,
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            zumal bei einer ausgebreiteten Schneedecke, ſo zieht ſich die
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            Luft ſtark zuſammen, die über einem Ort liegende Luftſäule
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            nimmt alſo ein geringeres Volumen ein als zuvor, es entſteht
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            cine Art Trichter in der Atmoſphäre, in den von allen Seiten Luft einſtrömt. </s>
            <s xml:id="echoid-s1181" xml:space="preserve">Dadurch wird das Luftvolumen aber bedeutend
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            vermehrt, der Luftdruck und mit ihm das Barometer ſteigt.
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            </s>
            <s xml:id="echoid-s1182" xml:space="preserve">Gleichzeitig treten abſteigende Luftſtröme auf, welche imſtande
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              <note symbol="*)" position="foot" xlink:label="note-094-01" xlink:href="note-094-01a" xml:space="preserve">Tieſe ſehr rohe Vorſtellung iſt nur bildlich zu nehmen. In
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              Wirklichkeit ſind die Verhältniſſe viel komplizierter.</note>
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