Peder Oluf Pedersen

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. 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. where he pointed out that the geomagnetic field means that the conductivity of the ionosphere is anisotropic.

Personal life Pedersen was married twice: to Maria Theodora Lihme in 1899 and then to Emma Clausen Gad. He had 4 children with his first wife (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, and Inger Margrethe Pedersen (Krøncke after marriage) (1909-1997) (author)), and 3 children with his second wife.