Johann Christoph Ilsemann
Johann Christoph Ilsemann (born April 7, 1727 in Clausthal ; † October 13, 1822 there ) was a German pharmacist , chemist and mineralogist . He headed the Ratsapotheke in Clausthal for around 60 years.
Live and act
His father Johann Wilhelm (1686–1766) was also a pharmacist in Clausthal. In addition to his apprenticeship as a pharmacist in Wolfenbüttel and Berlin , Johann Christoph Ilsemann also learned from him. He also taught himself a lot and thus earned a reputation as a scientist . He was a good businessman and made wealthy from deliveries of medicine. Often he was commissioned with chemical investigations as part of the Harz mining industry. At times he was the only specialist in the Harz region with the necessary chemical expertise for mining .
He made attempts to separate ores in mining, especially iron ores, and the separation of sulfur from iron ores with limestone .
In the journal The latest discoveries in chemistry , edited by Lorenz von Crell , he published on minerals, including the mineral from the Harz, which Hanns Höfer named Ilsemannite after him in 1871 and which contained molybdenum . Further publications concerned fiery mercury , the representation of silver and silver phosphate , the separation of barium oxide and iron, and manganese in iron ore.
His important mineral collection prompted Johann Wolfgang von Goethe to pay a visit in 1777 on his trip to the Harz Mountains. It was also the center of attraction for visits from other personalities such as the pharmacist Johann Bartholomäus Trommsdorff from Erfurt or the Saxon miner Johann Carl Freiesleben .
The beginnings of the mountain school (the later TU Clausthal ) consisted of special lectures at the Latin school in Clausthal, which Ilsemann held from 1775 to around 1800 on chemistry , mineralogy and metallurgy . For his achievements he was appointed mining commissioner by the Hanoverian king.
Ilsemann was an honorary member of the North German pharmacists' association. The doctor Lebrecht Friedrich Benjamin Lentin was one of his friends .
In 1762 he married Sophie Meyer (1743–1796), daughter of a pharmacist in Salzderhelden and Einbeck , and had at least five children with her. The son Karl Friedrich (1786–1865) was his successor as a pharmacist in Clausthal and also a mineralogist. His grandson Karl Ilsemann (1822–1899) was a secret councilor and Senate president at the Hanover regional court . Karl von Ilsemann (1856–1930), a great-grandson, was a Prussian lieutenant general . His son Sigurd von Ilsemann (1884–1952) was a wing adjutant of Wilhelm II in his exile in Doorn and Iwan von Ilsemann major general and military attaché in Switzerland during World War II .
literature
- Georg Schwedt : The Clausthaler Raths pharmacist Johann Christoph Ilsemann - chemist and mineralogist. BoD, Norderstedt 2018, ISBN 978-3-7481-8262-7 , limited preview in the Google book search.
- Herbert Dennert : Ilsemann, Johann Christoph. In: New German Biography (NDB). Volume 10, Duncker & Humblot, Berlin 1974, ISBN 3-428-00191-5 , pp. 140 f. ( Digitized version ).
- Heinrich Morich: A famous pharmacist in Clausthal - Johann Christoph Ilsemann . In: General Harz-Berg-Kalender 1941 , pp. 71–72.
Web links
- Schwedt's lecture on Ilsemann. In: Goslarsche Zeitung , January 8, 2019, (with picture by Ilsemann)
Individual evidence
| personal data | |
|---|---|
| SURNAME | Ilsemann, Johann Christoph |
| BRIEF DESCRIPTION | German pharmacist, chemist and mineralogist |
| DATE OF BIRTH | April 7, 1727 |
| PLACE OF BIRTH | Clausthal |
| DATE OF DEATH | October 13, 1822 |
| Place of death | Clausthal |