Carl Emil Krarup

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Carl Emil Krarup (born October 12, 1872 in Copenhagen ; † December 30, 1909 there ) was a Danish civil engineer who worked in the telegraph system.

His parents were of the same name Carl Emil Krarup (1841-1927) and Anna Johanne Henriette Bonnesen († 1909).

Carl Emil Krarup attended high school, first studied philosophy in Christianshavn from 1890 and switched to engineering training in the following year, which he finished in 1896 as a civil engineer. At first he worked as an assistant at his previous university.

He then became a senior engineer at the Copenhagen Office for Roads and Sewers and was responsible for the technical systems. In 1898 he went to the state telegraph system as a technical engineer aspirant, rose to head of the Fredericia telegraph station and then to head of the telegraph workshops in Copenhagen.

In 1901 the authorities sent him to the Physics Institute of the Würzburg University for a study visit, where he experimented on iron-wrapped copper conductors. AT & T's JS Stone patented one in 1897 (US Patent 578,275). In 1901 Franz Breisig proposed iron wrapping with an open helix. Krarup experimented with closed spirals. At that time, the University of Copenhagen had put out a tender on the self-induction of electrical lines. Krarup took part in the competition and published a treatise at Copenhagen University in March 1902, for which he won second prize. About his award he got into conversation with Pedersen (Paul Ole or Peder Oluf Pedersen ?), Who was convinced that Krarup was on the right track with his suggestion and encouraged him. The company Felten & Guilleaume manufactured a first 4 km long cable according to his specifications, which was laid through the Oeresund between the Danish Helsingör and Swedish Hälsingborg and went into operation on November 18, 1902. On December 1, 1902, Krarup was appointed telegraph engineer.

From 1902 to 1906 he was employed as director of state telegraphy. From 1903 to 1905 he assisted in setting up the radio telegraphic connection with Iceland. In 1903 he set up a radio telegraphic connection with the Lofoten Islands when the Norwegian telegraph system was further developed. He designed and established telephone exchanges, for example in 1906 in the Faroe Islands and in 1908 in Baku, Russia.

He married on August 23, 1904.

The Krarup cables were widely used until around 1935. Their production was relatively expensive, so that they were replaced by the Permalloy cables with higher inductance manufactured by Gustav Elmen from 1924 and by the Pupin coils manufactured from 1920.

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  1. ↑ electrosuisse.ch: Carl Emil Krarup (PDF; 30 kB)
  2. ↑ Archived copy ( Memento of the original from April 18, 2014 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2Template: Webachiv / IABot / www.datenschutz-praxis.de
  3. ↑ [1]  ( Page no longer available , search in web archives )  Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.@1@ 2Template: Toter Link / www.das-archiv.org  
  4. ↑ http://www.jstor.org/pss/3106751
  5. ↑ Family tree at noblecircles.com
  6. ↑ Anton A. Huurdeman: The worldwide history of telecommunications ; P. 321
personal data
SURNAME Krarup, Carl Emil
BRIEF DESCRIPTION Danish civil engineer who worked in the telegraph industry
DATE OF BIRTH October 12, 1872
PLACE OF BIRTH Copenhagen
DATE OF DEATH December 30, 1909
Place of death Copenhagen