Karl Ferdinand Braun
From Wikipedia, the free encyclopedia
| Karl Ferdinand Braun | |
 Ferdinand Braun
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| Born | June 6, 1850 Fulda, Hesse-Kassel, Germany |
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| Died | April 20, 1918 (aged 67) Brooklyn, New York |
| Residence | Germany |
| Nationality | German |
| Fields | Inventor and physicist |
| Institutions | University of Strasbourg |
| Alma mater | University of Marburg University of Berlin |
| Doctoral advisor | August Kundt |
| Doctoral students | Leonid Isaakovich Mandelshtam |
| Known for | CRT, Cat's whisker diode |
| Notable awards |  Nobel Prize in Physics (1909) |
Karl Ferdinand Braun (6 June 1850 in Fulda, Germany – 20 April 1918 in New York City, U.S.) was a German inventor, physicist and Nobel Prize laureate.
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[edit] Biography
Braun was educated at the University of Marburg and received a Ph.D from the University of Berlin in 1872. In 1874 he discovered that a point-contact semiconductor rectifies alternating current. He became director of the Physical Institute and professor of physics at the University of Strasbourg in 1895.
In 1897 he built the first cathode-ray tube oscilloscope. CRT technology is only now, over a century later, gradually being replaced by flat screen technologies (such as LCD, LED and Plasma) on television sets and computer monitors. The CRT is still called the "Braun tube" (Braunsche Röhre) in German-speaking countries (and in Japan: Buraun-kan).
During the development of radio, he also worked on wireless telegraphy. Around 1898, he invented a crystal diode rectifier or Cat's whisker diode. Guglielmo Marconi used Braun's patents (among others). Braun's British patent on tuning was used by Marconi in many of his tuning patents. Marconi would later admit to Braun himself that he had "borrowed" portions of Braun's work. In 1909 Braun shared the Nobel Prize for physics with Marconi for "contributions to the development of wireless telegraphy."
Braun went to the United States at the beginning of World War I to help defend the German wireless station at Sayville, N.Y. (on Long Island) against attacks by the British controlled Marconi Corporation. (At this time the U.S. had not yet entered the war). Braun died in his house in Brooklyn (New York City) before the war ended in 1918.
[edit] References
1. K.F. Braun: "On the current conduction in metal sulphides (title translated from German into English)", Ann. Phys. Chem., 153 (1874), 556. (In German) An English translation can be found in "Semiconductor Devices: Pioneering Papers", edited by S.M. Sze, World Scientific, Singapore, 1991, pp. 377-380.
2. Keller, Peter A.: The cathode-ray tube: technology, history, and applications. New York: Palisades Press, 1991. ISBN 0-9631559-0-3.
3. Keller, Peter A.: "The 100th Anniversary of the Cathode-Ray Tube," Information Display, Vol. 13, No. 10, 1997, pp. 28-32.
[edit] See also
[edit] External articles and references
- Patent
- Other
- "Ferdinand Braun – Biography". Nobel Lectures. Physics 1901-1921, Elsevier Publishing Company, Amsterdam, 1967.
- Naughton, Russell, "Karl Ferdinand Braun, Dr : 1850 - 1918".
- "Karl Ferdinand Braun ". Biographies of Famous Electrochemists and Physicists Contributed to Understanding of Electricity.
- Rybak, James P., "Forgotten" Pioneers of Wireless; Part 5 - Karl Ferdinand Braun".
- "Karl Ferdinand Braun, 1850-1918". (German) (English translation)
- The Ferdinand-Braun-Institut fuer Hoechstfrequenztechnik Berlin, Germany
- Alfred Thomas Story A Story of Wireless Telegraphy. D. Appleton and company 1904
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| Persondata | |
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| NAME | Braun, Karl Ferdinand |
| ALTERNATIVE NAMES | |
| SHORT DESCRIPTION | Inventor and physicist |
| DATE OF BIRTH | June 6, 1850 |
| PLACE OF BIRTH | Fulda, Hesse-Kassel, Germany |
| DATE OF DEATH | April 20, 1918 |
| PLACE OF DEATH | Brooklyn, New York |
