Fritz Koref

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Fritz Koref (born December 12, 1884 in Hanau ; † August 6, 1969 in Aarau ) was a physical chemist .

Life

His parents were Rabbi Markus Koref (* 1833 in Prague; † 1900) and his wife Recha, one of his brothers the lawyer Leo Koref (* 1876 in Rawitsch). The family registered on March 25, 1884 in the Hanau official apartment at Judengasse 56.

Fritz Koref was assistant to Walther Nernst . His colleagues included Niels Bjerrum and Frederick Alexander Lindemann . He took many measurements to confirm the specific heat laws of Nernst and Lindemann. He received a prize from the Elsa Neumann Foundation. In 1922 he bred more tungsten - single crystals . In 1930 he married the painter Gertrud Stemmler, b. Musculus , and moved to Berlin, where he was head of the Osram wire plant from 1932–1938 . With Richard Jacoby he discovered conditions under which the drawn tungsten wire acquires a relatively small crystalline structure when recrystallized, which is nevertheless dimensionally stable even at high temperatures. At about the same time as Frederick S. Goucher, he and Jacoby showed that it is possible to produce single crystals from drawn wires.

1938–1940 he worked at Fabriques Réunis de Lampes Éléctriques in Paris. Here he was interned several times, most recently with his wife for over a year in Camp de Gurs . They then lived in Lyon and escaped to Switzerland in early January 1943. He became a research associate at Wolframwerke Max Gloor and a consulting engineer at Glühlampenfabrik Gloria AG, Aarau. With Marcel Villat, Fritz Koref developed a process for the interior matting of incandescent lamps.

Publications

  • About the equilibrium in the formation of carbon disulfide ; 1910
  • with H. Braune: The heat of formation of lead iodide and lead chloride ; 1912
  • Measurements of the specific heat at low temperatures with the copper calorie meter
  • About the natural frequencies of elements in connections
  • Manufacture of metals from the vapor phase
  • with H. Fischvoigt: Experiments on the further growth of metal crystals by deposition from the gas phase ; 1922
  • with H. Wolff: On the question of the heat of recrystallization ; 1922
  • with H. Alterthum: Heterogeneous equilibria between tungsten and oxygen as well as water vapor at high temperatures ; 1925
  • with H. Alterthum: About the determinations of the vapor pressure of carbon ; 1925
  • About crystal tempering observations on the softening of solidified tungsten crystals ; 1930, In: Technical and scientific treatises from the Osram Group. First volume.
  • About the influence of the crystal structure on the dimensional stability of tungsten luminous bodies ; dito
  • with R. Gross and UK Moers: About the body shapes that occur when etching curved and hollow metal crystals ; dito
  • with Hubert Plaut : About the lifespan of evacuated and gas-filled filament lamps and the causes of their burnout
  • About the light output of the gas-filled tungsten double-coil lamp ; 1951
  • Report on Dr. jur. Leo Koref, Hanau, reimbursed by his brother Dr. Fritz Koref, Aarau (Switzerland), 2.3.1962
  • Lighting in churches and schools ; 1962

Web links

Individual evidence

  1. ↑ http://www.alemannia-judaica.de/hanau_rabbinat.htm
  2. ↑ http://www.hgv1844.de/aktuelles.html ( Memento from April 21, 2013 on WebCite )
  3. ↑ R. Tobies: "Tomorrow I would like to calculate 100 wonderful things again" . Steiner, Stuttgart 2010, p. 134.
  4. ↑ Oliver Morsch: Light and Matter . Weinheim 2012, p. 1705.
personal data
SURNAME Koref, Fritz
BRIEF DESCRIPTION Physical chemist
DATE OF BIRTH December 12, 1884
PLACE OF BIRTH Hanau
DATE OF DEATH 6th August 1969
Place of death Aarau