Gotthilf Hagen
God Help Heinrichshagen ( March 3, 1797 in Königsberg, † February 3, 1884 in Berlin, full name Gotthilf Heinrich Ludwig Hagen ) was a German engineer, Department of Hydraulic.
Hagen discovered in 1839 experimentally the laws of homogeneous laminar flow of viscous liquids, which were also derived independently of him, by the Frenchman Jean Léonard Marie Poiseuille and today are known as Hagen- Poiseuillesches law. The observations and the results of his researches were reflected in more than thirty scientific publications, including the publication of the first published in German three-volume " Handbook of Water Engineering " ( 1840-1865 ).
Life
The uncle of God Help Hagen was Karl Gottfried Hagen, who worked as a professor of physics and chemistry at the University of Königsberg. He looked at Hagens scientific training and inclinations at an early stage. With his two cousins, Ernst August Hagen, professor of aesthetics and art history as well as Carl Heinrich Hagen, professor of political economy at the Albertina University in Königsberg he was all his life in the rain contact. Hagen studied from 1816 at the University of Königsberg in Friedrich Wilhelm Bessel first mathematics and astronomy, turned from 1818 to Architecture and Construction to. God Help Hagen put 1819 surveyor exam and, after graduating as Baukondukteur in the civil service. There he occupied himself mainly with the hydraulic engineering. In 1822 he was in Berlin, the state examination as a builder. He became known through his publications on various hydraulic structures, which he visited during his study trips through Europe.
In 1824 he was therefore set by the Königsberg merchants as Baukondukteur, 1825, he moved to Gdansk as deputy government and building officer and a year later added as port construction inspector to Pillau, where he met the harbor and dyke construction. His methods for fixing dunes still find application.
On April 27, 1827 he married Auguste Hagen with whom he had two daughters and five sons and 1877 the golden wedding celebrated. His son Ludwig Hagen followed the father professionally, was ao Professor of maritime and port construction in Berlin and in 1876, the hitherto led by the father department.
In 1830 he moved to the Oberbaudeputation to Berlin and in 1831 Oberbaurat. From 1834 to 1849 he taught as a professor of hydraulic engineering at the Berlin Building Academy and the United Artillery and Engineering School in Berlin.
On April 7, 1842 he was on the recommendation of Alexander von Humboldt Member of the Royal Prussian Academy of Sciences in Berlin. The following year, he received an honorary doctorate from the University of Bonn for his scientific publications. 1849 he was appointed as an expert in the Frankfurt National Assembly, 1850, the appointment as lecturer Council in the Prussian Ministry of Commerce. In 1866 he was promoted in the Department Hydraulic Engineering and chairman of the technical Baudeputation Oberbaudirektor; 1869 Oberlandesbaudirektor, would be responsible for checking the large water and port facilities of Prussia and other German-speaking countries included. He held until his retirement in 1875 this function.
Decisive he was involved in planning the development of many German rivers and harbors. Thus the Prussian Admiralty gave him the lead in the planning of the " first German naval port at the Jade ", the later Wilhelmshaven. Hagen was on leave from his job in the Prussian Ministry of Commerce and took over the which was founded on July 8, 1855 Harbours Commission chairmanship of the new Prussian Jadegebiet. After the designs of two internationally known expert was not satisfied him, he put the Prussian Admiralty on May 29, 1856 before a port of its own design. This port design was marked by great foresight and expertise, because the design met the initially low requirements of the Prussian Admiralty and yet easily considered necessary space for later extensions and additions. The Hagen'sche harbor plan with mounting and urban settlement received on 25 June 1856, the consent and approval by Cabinet Order, King Frederick William IV of Prussia. Once the project, he returned to the Prussian Ministry of Commerce on 12 August 1856. The implementation of the plan was carried out in the following decade with various changes, but mainly resulting from the non- stationary development of port and shipbuilding. The plan defines today the plan of the city core.
Monuments and Honors
- On May 2, 1883, he was awarded first scheduling the medal for services to the construction industry " in gold."
- The city pillau built after the death of God Help Hagen a monument in his honor. The monument is still preserved in the present Baltijsk in Russia. It was supplemented by a Russian text, but is today by the Russian Navy.
- In Wilhelmshaven 2007 God Help -Hagen - square was inaugurated. A sculpture is to honor God Help Hagen, which was created by the Wilhelmshaven artist Dr. Hartmut Wiesner on him. The sculpture was the city of Wilhelmshaven home club " The Buoy" donated.
- After God Help Hagen in 1959 a pilot station ship, the " God Help Hagen " named.