Christmas Fern – Polystichum acrostichoides

by | Dec 9, 2023 | Ferns, NE Native Ferns

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For other people named Peter Peterson, see Peter Peterson (disambiguation).

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.

Poulsen and Pedersen painted by Knud Larsen, 1915.

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]

See also

References

  1. ^ a b Biography from the IEEE History Center retrieved 2011 Sept 28
  2. ^ Pedersen, Peder Oluf (1927). "The Propagation of Radio Waves along the Surface of the Earth and in the Atmosphere". Danmarks naturvidenskabelige Samfund. A (15a).
  3. ^ "Peder Oluf Pedersen". dtu.dk. DTU. Retrieved 16 July 2023.
  4. ^ "Person Record". tekhist.pastperfectonline. DTU Historie. Retrieved 16 July 2023.
  5. ^ 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.

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