Christel Hamann
Christel Bernhard Julius Hamann (born February 27, 1870 in Hammelwarden in Oldenburg (Land) , † June 9, 1948 in Berlin ) was a German inventor of calculating machines .
Life
His father was an Oldenburg border guard and messenger in Ellwürden (and his father a musician in Eutin ), his mother the daughter of a fisherman. Hamann completed an apprenticeship as a mechanic at the Nautical Institute in Bremerhaven and attended the technical center in Bremerhaven. Afterwards he was at A. Ott's mathematical-mechanical institute in Kempten (Allgäu) , in the workshops of Carl Zeiss in Jena and in the workshop of Carl Bamberg in Berlin. In 1896 he founded the Mathematical-Mechanical Institute in Berlin-Friedenau, where he built mathematical and surveying instruments that he developed himself. In 1900 he received the gold medal for his instruments at the world exhibition in Paris. In 1898 he developed the calculators Gauss and Berolina , where he as a stimulus for the Gauss the calculator of Gottfried Wilhelm Leibniz took a Leibniz wheel -drum.
In 1907 his institute was taken over by Mercedes office machines in Berlin. There he constructed the Mercedes Euklid calculating machine with the proportional lever principle developed by Hamann. He also improved machines for accounting.
In 1909 he built a difference machine .
From 1922 he worked for the company Deutsche Telephonwerke und Kabelindustrie in Berlin ( DeTeWe ). There he developed the ratchet system as a drive system for calculating machines, first in the Hamann Manus series from 1925. As chief designer, Christel Hamann and his colleague Heinrich Wilhelmi laid the essential foundations for the DeTeWe calculating machines, as they were built into the 1960s, before electronics replaced electromechanics.
In 1933 he received an honorary doctorate from the TH Berlin .
He was married to Hedwig Schindler (1872–1949) but had no children.
literature
- Rolf Stümpel (editor): Office machines from Berlin , Museum of Transport and Technology, Berlin 1988
- Hartmut Petzold Modern mathematicians. The industrialization of computer technology in Germany , CH Beck 1992
- Petzold computing machine , VDI Verlag 1985
- Ulf Hashagen The Gauss calculating machine - a failed innovation? , in U. Hashagen, O. Blumtritt, H. Trischler (editor) Circa 1903: Scientific and technical artifacts during the founding of the Deutsches Museum , Munich, 2003, pp. 371–398
- Werner Lange The work of Christel Hamann , Der Büromaschinen-Mechaniker, Issue 11, May 18, 1960, pp. 83–85
- Werner Lange A brief look at the Hamann calculating machines , Der Büromaschinen-Mechaniker, Issue 19, 1960, pp. 245-246, Issue 23, 1961, pp. 65-66, Issue 27, 1961, pp. 168-169, issue 68, 1964, pp. 186-188
- Werner Lange An interesting outsider: Hamann Rechenmaschinen , Der Büromaschinen-Mechaniker, Heft 127, 1969, pp. 66–67
- Heinz Nix: Hamann, Christel Bernhard Julius. In: New German Biography (NDB). Volume 7, Duncker & Humblot, Berlin 1966, ISBN 3-428-00188-5 , p. 573 ( digitized version ).
- Reese, Martin: About the person: The unknown Chr. Hamann. In: Historische Bürowelt No. 97 (Sept. 2014), pp. 11–18. See - IFHB
Web links
- Article Hamann in Computer Lexicon
- Christel Hamann's calculating machines
- Erhard Anthes: The last Hamann calculating machine, model 600
- Stephan Weiss, The Gauss calculating machine, original and model (pdf)
| personal data | |
|---|---|
| SURNAME | Hamann, Christel |
| ALTERNATIVE NAMES | Hamann, Christel Bernhard Julius (full name) |
| BRIEF DESCRIPTION | German inventor of calculating machines |
| DATE OF BIRTH | February 27, 1870 |
| PLACE OF BIRTH | Hammelwarden , Oldenburg (Land) |
| DATE OF DEATH | June 9, 1948 |
| Place of death | Berlin |