Friedrich Ahlborn

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Friedrich Christian Georg Ahlborn (born January 4, 1858 in Göttingen , † October 27, 1937 in Hamburg ) was a German zoologist and physicist .

Life

Ahlborn's father, the relay car master Andreas Christoph Ahlborn, died shortly before their son was born. Friedrich Ahlborn received his doctorate at the end of his scientific studies in Göttingen in 1882 under Ernst Ehlers on the brain of the Petromyzonts ( lampreys ). Until 1884 he worked as an assistant at the Göttingen Zoological Institute, before becoming a teacher at the Johanneum Realgymnasium in Hamburg in 1884 (later senior teacher; appointed professor there in 1903).

Ahlborn's research falls mainly in the field of flow research, often first presented as lectures at the Natural Science Association in Hamburg: Behavior of water blossoms against pressure (1893), flight movements of flying fish , mechanics of bird flight , air resistance of inclined surfaces (1894) etc. His analyzes of the Vogelflugs first attempts to manufacture artificial wings and air resistance measurements on them at the Hamburg observatory followed. Igo Etrich used Ahlborn's studies on flying seeds ( Zanonia ) and the stability of flying machines (1897) , which led to the construction of the Etrich Taube . As head of the hydrodynamic research institute at the Adlershof aircraft maintenance facility near Berlin from 1916 to 1918, Ahlborn was involved in developing the first streamlines. There he also continued the tests (and with the help of a friend: also recordings made underwater) of wave movements with regard to the construction of submarines, which had previously been carried out in his private apartment in Hamburg. "After the end of the war he turned to the investigation of the physics of the free atmosphere and made fundamental experimental investigations into the great phenomena of circulation in the atmosphere and the turbulence and the mechanism of resistance in spheres."

Part of the estate is at the Deutsches Museum . Friedrich Ahlborn is the brother of the natural scientist Hermann Ahlborn and father of Knud Ahlborn .

Works (selection)

  • Studies on the Petromyzont Brain. Engelmann, Leipzig 1883.
  • The flight of the fish. Lütcke and Wulff, Hamburg 1895 (Easter program from the Johanneum in Hamburg, 56 pages).
  • On the mechanics of bird flight . Friederichsen, Hamburg 1896. Reprint: Outlook Verl., Bremen 2011.
  • About the stability of the flying machines. in: Dep. from d. Area d. Natural science , ed. v. Natural science Ver. Hamburg, Vol. 15, 1897, pp. 1-51.
  • Mechanism d. Resistance of liquid media , in: Physikal. Ztschr. , Vol. 3, 1901.
  • About d. Mechanism d. hydrodynamic drag . Friederichsen, Hamburg 1902.
  • The glider flight. Explanation of the soaring flight of birds. The possibility of flying without a motor. R. Ouldenburg, Munich a. Berlin 1921.
  • The three great circulations d. Atmosphere , in: Btrr. z. Physics d. free atmosphere , vol. 11, Strasbourg 1923/24.
  • Magnus effect in theory and Reality , in: Ztschr. F. Flight technology u. Motorized Aviation , Vol. 20, 1929.
  • Dynamics d. Regens , in: Physikal. Ztschr. , Vol. 32, 1931.
  • Turbulence and Mechanism d. Resistance at balls u. Cylinders , in: Ztschr. F. techn. Physics , vol. 12, 1931.

literature

  • Peter Supf: The book of German flight history . Volume 2, Klemm Vlg., Berlin 1935, pp. 195-198.
  • Johannes Weissinger:  Ahlborn, Friedrich Christian Georg. In: New German Biography (NDB). Volume 1, Duncker & Humblot, Berlin 1953, ISBN 3-428-00182-6 , p. 107 f. ( Digitized version ).
  • Johannes Georgi: Professor Dr. Friedrich Ahlborn, a forgotten pioneer of fluid dynamics research. On his 100th birthday on January 4, 1958. In: Treatises and negotiations of the Natural Science Association in Hamburg . Hamburg, Vol. 2, 1957.
  • Andreas W. Daum : Science popularization in the 19th century. Civil culture, scientific education and the German public, 1848–1914 . Oldenbourg, Munich 1998, ISBN 3-486-56337-8 .

Individual evidence

  1. ↑ Erich R. Andersen: Adult Education Center in the dune sand. Pro BUSINESS, Berlin 2009. ( online )
  2. ^ Andreas W. Daum: Science popularization in the 19th century. Civil culture, scientific education and the German public, 1848–1914 . Oldenbourg, Munich 1998, ISBN 3-486-56337-8 , pp. 473 .
  3. ↑ Memory of his daughter-in-law Annali 1978, printed in: Andersen 2009, here p. 88f.
  4. ^ Weissinger, NDB 1 (1953), p. 107
  5. ^ Wilhelm Füßl: Friedrich Ahlborn estate . In: Archive info . Volume 5, number 2, Deutsches Museum, 2004, p. 4 (PDF)  ( page no longer available , search in web archives )  Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice. .@1@ 2Template: Toter Link / www.deutsches-museum.de  
personal data
SURNAME Ahlborn, Friedrich
ALTERNATIVE NAMES Ahlborn, Christian Georg Friedrich (full name)
BRIEF DESCRIPTION German zoologist and flow researcher
DATE OF BIRTH January 4, 1858
PLACE OF BIRTH Goettingen
DATE OF DEATH October 27, 1937
Place of death Hamburg