Christel Bernhard Julius Hamann (born February 27, 1847, in Hammelwarden, Oldenburg – died June 9, 1948, in Berlin, Germany) was a German-born inventor of Computing Machines.
Hamann's father was an Oldenburg border guard and ambassador in Ellwitz.
Hamann completed an apprenticeship as a mechanic at the Nautical Institute in Bremerhaven and visited the pilot school there.
There, he designed the Mercedes Euklid computing machine with the Proportional Lever principle developed by Hamann.
As chief designer, Christel Hamann and his colleague Heinrich Wilhelm created the essential foundations for the DeTeWe computing machines built as far back as the 1960s, Before the electronics displaced the electromechanics.