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Concept
Caspar Isenkrahe
Summary
Mathias Caspar Hubert Isenkrahe (12 May 1844, in Müntz, Rhine Province – 12 August 1921, in Trier) was a German mathematician, physicist and Catholic philosopher of nature.
Isenkrahe's father died before Caspar's birth. Isenkrahe visited in 1856 the Progymnasium in Jülich, in 1857 the Marzellengymnasium in Cologne and from 1858 to 1863 the Realprogymnasium in Bonn. In 1868 he studied at the University of Bonn where he chose the subjects mathematics, physics, chemistry, mineralogy, botany, zoology, philosophy, Latin and German. On 31 July 1866 he made his PhD with an award-winning work about the anatomy of Helicina titanica, a species of snail. He became a teaching authority as a senior primary school teacher (pro facultate docendi) on 26 February 1869 for his chosen courses.
After a probationary year 1869–1870 at the high school of Bonn, he worked at the high school of Krefeld (at least to 1878) and then at the Realprogymnasium in Bonn. Trying to change to a high school career at the mathematical faculty at the University of Bonn, he sent a habilitation document. The faculty approved his plan but it failed because of the Berlin government for reasons unconnected with the subject. A later attempt to receive a lectureship at the technical University of Braunschweig also failed. From 1893 to 1911 he was working as a high school professor at Trier until his retirement.
Until his death in 1921 he was actively engaged in the fields of mathematics, physics and natural philosophy. He corresponded with well-known mathematicians and physicists, such as Hermann von Helmholtz, Heinrich Hertz, Felix Klein and Philipp Lenard.
Because of his unusual scientific creativity and versatility, the philosophical faculty of the University of Bonn honored him demonstratively on the occasion of his golden doctoral anniversary with the renewal of his doctoral dignity on 31 July 1916. Caspar Isenkrahe died after serious physical sufferings on 12 August 1921.
His legacy is kept safe in Trier (with part in the town archives and the rest in the diocese archives).
Official source
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