Eduard Selling
Eduard Selling (born November 5, 1834 in Ansbach ; † January 31, 1920 in Munich ) was a German designer of calculating machines and a mathematician.
Selling studied mathematics at the Georg-August University in Göttingen and the Ludwig Maximilians University in Munich (with Philipp Ludwig von Seidel ). In 1859 he received his doctorate in Munich ( on prime numbers and the composition of numbers from them in the rational and complex-irrational number domains ). On the recommendation of Leopold Kronecker , he was appointed associate professor of mathematics at the Julius Maximilians University of Würzburg in 1860 - against the wishes of the philosophical faculty and mathematics professor Aloys Mayr by the Bavarian minister of education. He also taught astronomy there and became curator of the astronomical institute in 1879. In addition, from 1877 he dealt with insurance, among other things for the reorganization of pensions in Bavaria on behalf of the Bavarian government. His application for promotion to full professor, made in 1891, was rejected because he had not dealt with geometry and had not had a successful teaching position. In 1906 he retired.
He initially used Thomas de Colmar's calculating machines for his own extensive calculations, but he was dissatisfied with them. He built multiplying machines based on the model of the Nuremberg scissors , which he patented in 1886 and which received an award at the Chicago World's Fair in 1893. It was, however, complicated to use and manufacture, and was of little practical importance. Around 30 to 40 devices were manufactured by Max Ott in Munich by 1898. He also built a few copies of an improved version and designed a third electric machine (patent 1894).
As a young man, the later inventor of calculating machines, Christel Hamann , the son of a friend of Selling, was involved in the construction. Examples of his machine are in the Deutsches Museum .
literature
- Selling: A new calculating machine , Berlin 1887
- Hans-Joachim Vollrath : About Aurel Voss' appointment to the chair for mathematics in Würzburg. In: Würzburger medical history reports , Volume 11, 1993, pp. 133–151, here: pp. 133 and 145 f. ( Eduard Sellings' proposal ).
Web links
- Selling in calculator dictionary
- History of Computer to his Computer and Biography
- Stephan Weiss The multiplying machines by Eduard Selling , 2004, pdf
- Selling at the history of mathematics in Würzburg
Individual evidence
| personal data | |
|---|---|
| SURNAME | Selling, Eduard |
| BRIEF DESCRIPTION | German designer of calculating machines and mathematician |
| DATE OF BIRTH | November 5, 1834 |
| PLACE OF BIRTH | Ansbach |
| DATE OF DEATH | January 31, 1920 |
| Place of death | Munich |