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Vergleichende Untersuchungen �ber Den Anatomischen Bau Der Geflügelten Früchte Und Samen (Classic Reprint)

Vergleichende Untersuchungen �ber Den Anatomischen Bau Der Geflügelten Früchte Und Samen (Classic Reprint)

          
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About the Book

Excerpt from Vergleichende Untersuchungen �ber den Anatomischen Bau der Geflügelten Früchte und Samen

So verschieden auch die Formen der Flugel im Allgemeinen sind, so sehen wir doch einige derselben besonders häufig in den verschiedensten Familien mit überraschend gleichem anatomischem Bau wiederkehren. Dies gilt ganz besonders vom Typus Acer. Von allen Früchten und Samen, die unter stark beschleunigter Drehung fallen, Scheint dieser die vollkommenste Konstruktion zu repräsentieren; denn nicht nur die Bewegungsvorgänge gelangen zu einer grossen Vollkommen heit und Kompliziertheit, die Leistungsfähigkeit steigt bei denselben nach Dingler bis während sie bei andern, wie zum Beispiel bei Fraxinus, nur den Grad von sondern auch die mechanischen Konstruktionen zeigen eine hohe Stufe der Vollkommenheit und Zweck mässigkeit. Es kann uns deshalb nicht wundern, dass die Verbreitung der geflügelten Samen und Früchte dieses Typus sich schnell über weite Bezirke erstreckt. So kann ein einzelner Baum eines Parkes oft einen grossen Teil desselben mit seiner Nachkommenschaft besiedeln. Die An ordnung der Skelettelemente bei Acer erinnert uns gleich auf den ersten Blick an die zweck entsprechenden Einrichtungen bei den Flügeln der Insekten und den kräftigeren, praktisch er probten Konstruktionen der Windmühlenflügel. Im letzteren Fall ganz besonders ist auch die Inanspruchnahme auf Festigkeit eine ganz ähnliche wie beim Acertypus. Wir haben als Kraft den Wind, der auf die Fläche der Flügel wirkt und dieselben, da sie sich zur Angriffsrichtung in schiefer Einstellung befinden, zur Drehung bringt. Auch hier ist die eine Flügelkante gegen über der andern erheblich starker, weil sie beim Rotieren dem Luftdruck den meisten Wider stand entgegenzusetzen hat. Diese Flanke giebt dem ganzen Flugel Halt in der Längsrichtung, während der übrige Teil nur schwache Versteifungen besitzt.

About the Publisher

Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com

This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.


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Product Details
  • ISBN-13: 9781332570805
  • Publisher: Forgotten Books
  • Publisher Imprint: Forgotten Books
  • Height: 225 mm
  • No of Pages: 32
  • Series Title: German
  • Weight: 68 gr
  • ISBN-10: 1332570801
  • Publisher Date: 07 Nov 2018
  • Binding: Paperback
  • Language: German
  • Returnable: N
  • Spine Width: 2 mm
  • Width: 150 mm


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