Friedrich Kühnen
Friedrich Kühnen (born May 12, 1858 in Brühl near Cologne, † January 8, 1940 in Münster ) was a German geodesist .
He studied mathematics, physics and geodesy in Bonn, Paris, Göttingen, Berlin, Geneva and Marburg, where he received his doctorate in 1888. He then worked as an assistant until he was appointed as an auxiliary computer at the Geodetic Institute Potsdam in 1891 by Friedrich Robert Helmert . In 1897 he became an observer and from 1919 to 1923 head of department, professor and secret councilor.
From 1899 to 1904, together with his assistant Philipp Furtwängler , he determined the magnitude of gravity in Potsdam using reversion pendulums. The results of the gravimetric measurements were used a short time later to determine the Potsdam gravity system .
He worked on leveling trains in Europe.
For the Geodetic Institute he constructed a comparator for the calibration of standards and set up the calculation for the tide calculator .
Publications
- About the Galois group of the equation of the 27th degree, on which the straight lines on the general surface of the third order depend ; Marburg, Universitätsbuchdruckerei (CL Pfeil) 1888.; Dissertation: Inaug.-dissertation .-- Marburg
- Determination of the absolute magnitude of gravity in Potsdam with reversion pendulums ; with Furtwängler; Berlin, P. Stankiewicz, 1906
- The new measurement of the baselines at Strehlen, Berlin and Bonn carried out. by d. geodetic institute ; with Richard Schumann ; Stankiewicz, 1897
- The mean water of the Baltic Sea near Travemünde, Marien Leucht, Wismar, Warnemünde, Arkona, Swinemünde, Pillau, Memel, and the mean water of the North Sea near Bremerhaven in the years 1898-1910 ; Stankiewicz, 1916
literature
- Gerhard Engelmann: Kühnen, Friedrich. In: New German Biography (NDB). Volume 13, Duncker & Humblot, Berlin 1982, ISBN 3-428-00194-X , p. 206 f. ( Digitized version ).
Individual evidence
| personal data | |
|---|---|
| SURNAME | Kühnen, Friedrich |
| BRIEF DESCRIPTION | German geodesist |
| DATE OF BIRTH | May 12, 1858 |
| PLACE OF BIRTH | Brühl near Cologne |
| DATE OF DEATH | January 8, 1940 |
| Place of death | Muenster |