Hans Friedrich Geitel

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Hans Geitel
Grave of Hans Geitel in the main cemetery in Wolfenbüttel

Hans Friedrich Geitel (born July 16, 1855 in Braunschweig , † August 15, 1923 in Wolfenbüttel ) was a German physicist .

Life

Hans Geitel came to Blankenburg in 1861 when his family moved, his father was a forester , and grew up there in the immediate vicinity of Julius Elster . He attended school and high school together with Elster. A lifelong friendship developed between them, and their own interest in the natural sciences resulted in a common field of activity.

Both years of study were spent in Heidelberg and Berlin . In 1879 Geitel passed his teaching examination in Braunschweig and took up a position as a teacher in Wolfenbüttel at the large school . In 1881 Geitel succeeded in bringing Julius Elster to the grammar school as well. There they intensified their joint research. Karl Bergwitz (1875–1958), who continued both studies, was one of her students there. In 1892 Geitel was elected a member of the Leopoldina . In 1921 he was elected a foreign member of the Göttingen Academy of Sciences .

Act

Geitel and Elster presented papers on meteorology , atomic physics and the photoelectric effect . Geitel recognized the law of decay of radioactivity and coined the term atomic energy in 1899 . In 1893 they invented the photocell .

Fonts (selection)

  • Elster, Julius and Geitel, Hans: Experiments on hyperphosphorescence. Supplements to the Annals of Physics and Chemistry, 21: 455, 1897.
  • Elster, Julius and Geitel, Hans: About the influence of a magnetic field on the conductivity of the air caused by the Becquerel rays. Negotiations of the German Physical Society, 1: 136-138, May 1899.
  • Elster, Julius and Geitel, Hans: On ozone formation on glowing platinum surfaces and the electrical conductivity of the air ozonized by phosphorus. Annals of Physics and Chemistry, 275: 321-331, 1890.
  • Elster, Julius and Geitel, Hans: Attempts at Becquerel rays. Annals of Physics and Chemistry, 302: 735-740, 1898.

Awards and honors

In 1899 he was awarded an honorary doctorate from the University of Göttingen and in 1915 - together with Elster - from the Technical University of Braunschweig . In 1937 the Geitelsteig in Berlin-Charlottenburg was named after him.

literature

  • Rudolf GA Fricke: J. Elster & H. Geitel - youth friends, high school teachers, scientists from passion, Döring Druck, Braunschweig 1992.
  • Rudolf GA Fricke, Kristian Schlegel: Julius Elster and Hans Geitel - Dioscuri of physics and pioneer investigators in atmospheric electricity . In: Hist. Geo Space Sci. tape 8 , 2017, p. 1–7 , doi : 10.5194 / hgss-8-1-2017 (English, hist-geo-space-sci.net [PDF]).
  • Horst-Rüdiger Jarck, Günter Scheel (Ed.): Braunschweigisches Biographisches Lexikon. 19th and 20th centuries , Hannover 1996, pp. 203-204.
  • Martin Weiser:  Geitel, Hans. In: New German Biography (NDB). Volume 6, Duncker & Humblot, Berlin 1964, ISBN 3-428-00187-7 , p. 164 ( digitized version ).

Web links

Individual evidence

  1. ↑ Holger Krahnke: The members of the Academy of Sciences in Göttingen 1751-2001 (= Treatises of the Academy of Sciences in Göttingen, Philological-Historical Class. Volume 3, Vol. 246 = Treatises of the Academy of Sciences in Göttingen, Mathematical-Physical Class. Episode 3, vol. 50). Vandenhoeck & Ruprecht, Göttingen 2001, ISBN 3-525-82516-1 , p. 90.
  2. ↑ Geitelsteig. September 9, 2014, accessed June 26, 2020 .
personal data
SURNAME Geitel, Hans Friedrich
ALTERNATIVE NAMES Geitel, Hans Friedrich Karl
BRIEF DESCRIPTION German physicist
DATE OF BIRTH July 16, 1855
PLACE OF BIRTH Braunschweig
DATE OF DEATH August 15, 1923
Place of death Wolfenbüttel