Otto Lummer

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Memorial plaque at the former location of Lummer's birthplace and home in Gera, Schloßstraße 6

Otto Richard Lummer (born July 17, 1860 in Gera , † July 5, 1925 in Breslau ) was a German physicist .

Career

Origin and education

Otto Lummer was the youngest of six children of the master baker Carl Gottfried Lummer (1822-1891) and Minna Agnes nee. Ortlepp (1831–1920) was born in his parents' house in what was then Schloßstraße 14/15 (today Schloßstraße 6) in Gera, where his father's bakery was also located. Lummer's ancestors had lived in Gera and Untermhaus as bakers and confectioners for generations . He attended the first-class secondary school on the Nicolaiberg (today Goethe-Gymnasium / Rutheneum , House I) and passed the oral Abitur examination there on March 16, 1880.

Working as a physicist

Otto Lummer had studied at various German universities before he became an assistant to Hermann von Helmholtz in Berlin in 1884 . There he worked at the Physikalisch Technische Reichsanstalt , where he became a professor in 1894. From 1904 he was a professor in Breslau .

Otto Lummer was the first to discover the interference phenomena on plane-parallel glass plates. Together with Eugen Brodhun (1860–1938) he invented the photometer cube .

Together with Ernst Pringsheim (1859–1917) he also carried out fundamental investigations into the distribution of energy in the spectrum of a black body , which led Max Planck to draw up his quantum hypothesis .

Together with Wilhelm Wien , he manufactured the first black body radiator, consisting of a blackened hollow sphere with a small outlet opening.

Lummer also developed a mercury vapor lamp to produce monochromatic light; In 1902 he built a high-resolution spectroscope .

Honors

The death mask Lummers was in the late 1920s Gera City Museum issued. Their whereabouts are unknown; it was probably lost in the air raids on Gera in World War II .

During the construction of the new development area in Bieblach -Ost, the city of Gera named a street after him on August 3, 1988. By mistake, however, the street was initially named Otto-Cummer-Straße ; The mistake was only corrected on March 1, 1991 as part of the renaming of numerous Geraer streets in the course of German reunification.

One day before Lummer's 150th birthday in 2010, the then Mayor of Gera, Norbert Vornehm, unveiled a plaque at the former location of Lummer's birthplace and home. Since 2008 a locomotive of the tram has also been named Gera Lummer.

Fonts

  • Basics, goals and limits of lighting technology (eye and light generation) , Oldenbourg Verlag, Munich, Berlin, 1918

literature

Web links

Commons : Otto Lummer  - Collection of images, videos and audio files

Individual evidence

  1. ↑ See Bussemer / Müller, Otto Lummer - looking for traces in Gera , p. 50; and family tree on p. 54f.
  2. ↑ See Bussemer / Müller, Otto Lummer - looking for traces in Gera , p. 49f.
  3. ↑ See Bussemer / Müller, Otto Lummer - looking for traces in Gera , p. 51.
  4. ↑ See Bussemer / Müller, Otto Lummer - looking for traces in Gera , p. 53.
  5. ↑ See Siegfried Mues: The street names of the city of Gera from A to Z. Their history and stories. Publishing house Dr. Frank, Gera 2006, ISBN 3-934805-23-X , pp. 214f.
personal data
SURNAME Lummer, Otto
ALTERNATIVE NAMES Lummer, Otto Richard (full name)
BRIEF DESCRIPTION German physicist
DATE OF BIRTH July 17, 1860
PLACE OF BIRTH Gera
DATE OF DEATH July 5, 1925
Place of death Wroclaw