Louis Kruger

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The birthplace in Elze

Johann Heinrich Louis Krüger (born September 21, 1857 in Elze ; † June 1, 1923 there ) was a German mathematician and geodesist . He edited the geodetic records of Carl Friedrich Gauß . His work presented in 1912 with the title "Conformal mapping of the earth ellipsoid in the plane" forms the basis for the Gauß-Krüger coordinate system introduced in 1923 .

Life

Johann Heinrich Louis Krüger was born in Elze in 1857 . His father, Konrad Krüger, was a master locksmith , and so Louis Krüger first completed an apprenticeship as a locksmith in order to take over his parents' business. Because of his mathematical talent, however, he was encouraged by his then rector Tölke to continue his education, which his father did not like.

The young Louis Krüger switched from his apprenticeship to a small private school in Elzer and shortly afterwards attended the Hildesheim trade school. He could only raise the money he needed to attend school through donations and loans. After his outstanding audit Louis Kruger went to the Polytechnic Institute in Berlin to there mathematics to study. After four years he finished his studies.

During his studies, Louis Krüger developed his passion for geodesy (the science of measuring the earth and depicting it on maps). At the age of 27 he received his doctorate in this field . He then went to the Royal Prussian Geodetic Institute in Berlin, where he first became an assistant, then a professor and finally deputy director.

In 1903, Louis Krüger further developed the work of his predecessor Carl Friedrich Gauß, including the mathematical method of depicting the curved surface of the earth on flat maps. Because both scientists were involved, this is known to this day as the Gauß-Krüger projection .

He had been a member of the Leopoldina since 1910 . In 1918 he was elected a corresponding member of the Göttingen Academy of Sciences .

After 38 years, Krüger returned to his hometown Elze and died there in 1923 at the age of 65.

Honors

Memorial plaque on the house where he was born in Elze
  • On December 20, 1921, Krüger was awarded the honorary title of doctoral engineer by the Technical University of Berlin .
  • In the 1930s, a memorial plaque was attached to the house where Kruger was born.
  • A memorial stone that was erected on the occasion of his 100th birthday in 1957 can be found in Elze's city park.
  • For its 150th birthday, the Krüger-Adorno-Schule set up a memorial across from the house where he was born in Hauptstrasse.
  • The former research ship Professor Albrecht Penck and the current sea rescue ship Alan Kurdi originally had the name Joh. L. Krueger .

Works (selection)

  • The geodesic line of the spheroid and investigation of when it ceases to be the shortest line. Diss., Schade Verl., Berlin 1883.
  • Conformal mapping of the earth's ellipsoid in the plane. 1912.

literature

Web links

Individual evidence

  1. ↑ Holger Krahnke: The members of the Academy of Sciences in Göttingen 1751-2001 (= Treatises of the Academy of Sciences in Göttingen, Philological-Historical Class. Volume 3, Vol. 246 = Treatises of the Academy of Sciences in Göttingen, Mathematical-Physical Class. Episode 3, vol. 50). Vandenhoeck & Ruprecht, Göttingen 2001, ISBN 3-525-82516-1 , p. 140.
  2. ↑ in: Zentralblatt der Bauverwaltung , 42nd year, No. 1 u. 2 (January 4, 1922), p. 6
personal data
SURNAME Kruger, Louis
ALTERNATIVE NAMES Krüger, Johann Heinrich Louis (full name)
BRIEF DESCRIPTION German mathematician and geodesist
DATE OF BIRTH September 21, 1857
PLACE OF BIRTH Elze
DATE OF DEATH June 1, 1923
Place of death Elze