You are bidding on one typed, signed letter the physicist and university teacher Wilhelm Kohlrausch (1855-1936).

Dated Hanover, 4th Nov. 1921.

directed atthe chemist Wilhelm Eschweiler (1860-1936), Professor at the Technical University of Hanover,

Wilhelm Kohlrausch, as "Head of Department IV." (=Department IV for chemical-technical and electrotechnical sciences of the Technical University of Hanover) Wilhelm Eschweiler with, "that the department college in its meeting of 3. i.e. Mts. has decided to involve you in future department meetings in an advisory capacity."

Hand signed "cabbage rush."

Scope:1 p. (27.8 x 21.8 cm).

Without envelope.

Condition: leaf folded; Paper slightly browned and slightly creased. BPlease also note the pictures at the end of the item description!

Internal note: Eschweiler Autograph Autograph

About Wilhelm Kohlrausch and Wilhelm Eschweiler (source: wikipedia):

Wilhelm Friedrich Kohlrausch (* 14. May 1855 in Marburg; † 16 April 1936 in Hanover) was a German physicist and, as a university teacher for electrical engineering, rector of the Technical University of Hanover from 1892 to 1895.

Life: Wilhelm Kohlrausch's father Rudolf Kohlrausch (1809-1858) was a physicist and from 1857 a professor of physics at the University of Erlangen. His brother, Friedrich Kohlrausch (1840-1910) became a university teacher in Zurich, Darmstadt, Würzburg and Strasbourg. His son Arnt Kohlrausch (1884-1969) was a professor of physiology at the Universities of Berlin, Greifswald and Tübingen.

Wilhelm Kohlrausch studied physics in Würzburg and was a student of August Kundt. In 1879 he received his doctorate in Würzburg on "On the experimental determination of the speed of light in crystals" and remained at the Physics Institute there until 1883.

After working briefly in 1882 as an assistant at the Physics Institute of the University of Strasbourg, he acquired an extraordinary professorship in theoretical physics. In 1884 he was appointed to the TH Hannover, where he worked from January 1st. October 1884 held the professorship for electrical engineering. from 1 July 1892 to 30 On June 1, 1895 he was rector of the university and from 1899 to 1928 a member of the board of trustees of the Physikalisch-Technische Reichsanstalt (PTR). He was also a calibration inspector and a member of the technical advisory board for the Hanover Tramway AG.

He retired in the winter semester of 1923, but continued to teach in his field until 1927. His successors were Karl Humburg and Harald Schering. Kohlrausch died on 16. April 1936 in Hanover.

In 1887 he was admitted to the German Academy of Natural Scientists Leopoldina. He held the title of Privy Councilor and an honorary doctorate from Dr.-Ing. hc

writings

Observations on the theory of dynamo machines, 1887

On a connection between magnetizability and electrical conductivity in different types of iron and nickel, 1887

For publications with his brother F. Kohlrausch see up to 1886, Ann. of Physics 27, 1 (1886)

Wilhelm Eschweiler (* 1. December 1860 in Euskirchen; † 21 March 1936) was a German chemist. He was a professor at the Polytechnic in Hanover.

Eschweiler passed the matriculation examination (upper secondary) at the Knickeberg Institute in Telgte and completed an apprenticeship as a pharmacist in Goch. After that he traveled to pharmacies in Düsseldorf, Frankfurt, Elberfeld, Wiesbaden, Metz and Hamburg and then studied pharmacy at the University of Munich with the state examination in 1886. A year later he was an assistant to Karl Kraut at the Inorganic Institute of the TH Hannover. During this time as an assistant in Hanover, he received his doctorate in 1889 at the University of Rostock (contributions to the knowledge of formaldehyde). In 1892 he became a lecturer in analytical chemistry in Hanover, where he also taught food chemistry. In 1895 he received the title of professor. From 1900 to 1934 he was a lecturer in special analytical chemistry and in 1921 he became an associate professor. From 1927 to 1929 he was senior assistant.

He was particularly interested in mineral dyes, polythionic acids and was considered an expert in explosives and gunpowder. In the latter area, he was often active as a consultant in industry and investigated, among other things, the explosion accident (explosion of the Oppau nitrogen plant) in Ludwigshafen-Oppau in 1921. Much of his research has been published in the theses and dissertations of his students. One of his students was Fritz Strassmann.

The Eschweiler-Clarke methylation is named after him and Hans Thacher Clarke. Eschweiler published the work on this in 1905 (Chem. Ber., Vol. 38, 1905, pp. 880–892) and Clarke 1933. Sometimes it is therefore also known only as the Eschweiler method.

writings

On the constitution of the acid amides, reports of the German chemical society, volume 30, 1897, issue 8

Replacement of hydrogen atoms bound to nitrogen by the methyl group with the aid of formaldehyde, reports of the German Chemical Society. vol. 38, no. 1, 1905