Heinrich Hohenner

Heinrich Johann Hohenner (born December 7, 1874 in Wunsiedel , † April 29, 1966 in Darmstadt ) was a German geodesist and professor of geodesy .

Life

Heinrich Hohenner was born in 1874 as the son of the master pewter Johann Karl Hohenner (1842–1919) and Katharina Gebhardt (1842–1896) in Wunsiedel, Upper Franconia. From 1890 he attended the industrial school in Nuremberg for two years and then switched to the TH Munich . He completed his studies in geodesy in 1894 with a diploma. Then he worked at the measurement office in Wunsiedel. In 1896 he returned to the Technical University of Munich as a research assistant and passed the state examination for surveying engineers. He wrote numerous papers for the Royal Bavarian Commission for International Geometric Surveying. In 1898 he received his habilitation and taught as a private lecturer at the TH Munich. In the summer semester of 1902, he accepted a call to an associate professor at the TH Stuttgart . In 1904 he obtained his doctorate in Stuttgart as Dr. Engineer. His dissertation was titled Graphical-Mechanical Adjustment of Trigonometrically Switched-On Points . In it and in the following years, Hohenner was particularly concerned with the development and improvement of geodetic instruments. He was also involved in the training of surveyors. In 1907, the TH Braunschweig appointed him full professor of geodesy. His textbook Geodesy , which appeared in 1910 and was widely distributed, was also created in Braunschweig .

In the winter semester of 1910/11 he took up a full professorship for geodesy at the TH Darmstadt , where the Geodetic Institute had just been founded. Here he taught for almost 55 years as a full professor of geodesy and head of the Geodetic Institute. His main focus was on geodetic instruments. The devices he (further) developed include a. the Hohenner precision distance meter, the Hohenner measuring microscope and the “Hensoldt cross visor”.

As a result of Hohenner's work, a full course of study for surveyors was set up at the TH Darmstadt in 1921, which lasted until the beginning of the Second World War.

At the age of 68 he retired in 1943. In the absence of a successor, however, he continued to teach. After the institute was destroyed in September 1944, he took part in its reconstruction after the Second World War. His final retirement took place in 1949, although he continued teaching until a few months before his death. When his successor, Heinrich Kuhlmann, died unexpectedly in 1953, he took over the acting management of the institute in 1953/54.

From 1917 to 1919 Hohenner was dean of the general department, from 1919 to 1920 dean of the department of mathematics, natural sciences and general subjects at the TH Darmstadt.

Heinrich Hohenner died in April 1966 at the age of almost 92. He had been married to Emilie Oberländer, a daughter of the painter Adolf Oberländer , since 1902 .

Honors

• 1946: Honorary citizen of the city of Wunsiedel.
• 1949: Honorary member of the State Association of Hesse in the German Association for Surveying.

In Wunsiedel a street was named after Heinrich Hohenner.

Publications (selection)

• Graphical-mechanical adjustment of trigonometrically activated points. Dissertation, Technical University of Munich, Munich 1904. Supervisors: Max Carl Ludwig Schmidt and Sebastian Finsterwalder .
• Geodesy. A guide to geodetic measurements for beginners with the basics of hydrometry and (astronomical) time and location determination. Teubner, Leipzig / Berlin 1910.
• About the rational measurement of a country. Speech to celebrate the birthday of His Royal Highness the Grand Duke Ernst Ludwig of Hesse and near the Rhine on November 25, 1912 in the auditorium of the Grand Ducal Technical University of Darmstadt, given by Heinrich Hohenner. With 11 panels. Printed by CF Winter, Darmstadt 1913.
• The Hohenner Precision Distance Knife and its connection with a Theodorlite. Establishment and use by H. Hohenner (= treatises and lectures from the field of mathematics. 4). Teubner, Leipzig / Berlin 1919.
• FR Helmert: The adjustment calculation using the least squares method with applications to geodesy, physics and the theory of measuring instruments. Provided with an appendix by H. Hohenner. 3. Edition. Photomechan. Rubber printing process. XVIII, Teubner, Leipzig 1924.

literature

• Wolfgang Torge: Heinrich Hohenner (1874–1966) . In: History of geodesy in Germany . Walter de Gruyter, Berlin 2007, ISBN 978-3-11-092510-4 ( books.google.com ).
• Melanie Hanel: Normality under exceptional conditions. The TH Darmstadt under National Socialism . Knowledge Buchgesellschaft, Darmstadt 2014, ISBN 978-3-534-26640-1 (Additional dissertation Techn. Univ. Darmstadt 2013).
• Christa Wolf, Marianne Viefhaus: Directory of professors at the TH Darmstadt: Higher trade school, technical school, polytechnic school, technical university (=  Darmstadt archive publications . No. 3 ). Publishing house of the Historical Association for Hesse, Darmstadt 1977, OCLC 14933128 .
• Walter Ohlemutz:  Hohenner, Heinrich. In: New German Biography (NDB). Volume 9, Duncker & Humblot, Berlin 1972, ISBN 3-428-00190-7 , p. 493 f. ( Digitized version ).
• Jan Nils van der Püten: 55 years in the service of the TH Darmstadt: Heinrich Hohenner, Professor of Geodesy. In: high 3. Vol. 12, May 2016, p. 19.

Individual evidence

1. ↑ Hohenner, Heinrich Johann. Hessian biography. (As of March 14, 2013). In: Landesgeschichtliches Informationssystem Hessen (LAGIS).
2. ↑ Hohenner April 1, 1907 - September 30, 1910. on tu-braunschweig.de