en Peder Oluf Pedersen

Peder Oluf Pedersen
Peder Oluf Pedersen
Born	19 June 1874; Sig, Varde, Denmark
Died	30 August 1941 (aged 67); Copenhagen, Denmark
Nationality	Danish
Alma mater	College of Advanced Technology
Known for	Wire recording, the arc converter (both in collaboration with Valdemar Poulsen)
Spouse(s)	Maria Theodora Lihme (m. 1899)(1871-1930); Emma Clausen Gad (1902-1997)
Children	Kai Oluf Pedersen (1901-1991) (scientist) ; Ellen Margrethe Charlotte Pedersen (1903-1979) married to Børge Jessen (both mathematicians); Gunnar Pedersen (1905-1997) Director General of The Postal and Telegraph Directorate ; Inger Margrethe Pedersen, married name Krøncke (1909-1997) (author); 3 children with his second wife
Awards	Royal Danish Academy of Sciences and Letters Gold Medal (1907) ; H. C. Ørsted Medal (1928) ; IRE Medal of Honor (1930)
	Scientific career
Fields	Physicist
Institutions	College of Advanced Technology

Peder Oluf Pedersen (19 June 1874 – 30 August 1941) was a Danish engineer and physicist. He is notable for his work on electrotechnology, his cooperation with Valdemar Poulsen on the developmental work on Wire recorders, which he called a telegraphone, the arc converter known as the Poulsen Arc Transmitter, and his work on electrical currents in the ionosphere.

Pedersen became a professor of telegraphy, telephony and radio in 1912.^[1] He became principal of the College of Advanced Technology (Den Polytekniske Læreanstalt) in 1922, a title he held until his death. He was a Fellow of the American Institute of Electrical Engineers and was a member of the British Institution of Electrical Engineers. In 1915 he became a Fellow of the Institute of Radio Engineers.^[1]

The first expression for the Pedersen current was formulated by Pedersen from in his 1927 work "The Propagation of Radio Waves along the Surface of the Earth and in the Atmosphere",^[2]^[3]^[4] where he pointed out that the geomagnetic field means that the conductivity of the ionosphere is anisotropic.^[5]

References

^ ^a ^b Biography from the IEEE History Center retrieved 2011 Sept 28
^ Pedersen, Peder Oluf (1927). "The Propagation of Radio Waves along the Surface of the Earth and in the Atmosphere". Danmarks naturvidenskabelige Samfund. A (15a).
^ "Peder Oluf Pedersen". dtu.dk. DTU. Retrieved 16 July 2023.
^ "Person Record". tekhist.pastperfectonline. DTU Historie. Retrieved 16 July 2023.
^ Chapman, S. (1956-08-01). "The electrical conductivity of the ionosphere: A review". Il Nuovo Cimento (1955-1965). 4 (4): 1385–1412. doi:10.1007/BF02746310. ISSN 1827-6121. Retrieved 2023-07-16.