Arthur Scherbius
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Arthur Scherbius (20 October 1878–13 May 1929) was a German electrical engineer who patented an invention for a mechanical cipher machine, later sold as the Enigma machine.
Scherbius was born in Frankfurt-am-Main and was the son of a small businessman. He studied electricity at the Technical College in Munich, and then went on to study at the Technical College in Hanover, finishing in March 1903. The next year, he completed a dissertation, "Proposal for the Construction of an Indirect Water Turbine Governor", and was awarded a doctorate in engineering.
Scherbius subsequently worked for several electrical firms in Germany and Switzerland. In 1918, he founded the firm of Scherbius & Ritter. He made a number of inventions, e.g. asynchronous motors, electric pillows and ceramic heating parts; his research contributions led to his name being associated with the Scherbius principle for asynchrous motors.
Scherbius applied for a patent (filed 23 February 1918) for a cypher machine, and eventually began to market the Enigma cypher machine for commercial use. Scherbius' company also purchased the rights to another patent for a rotor machine from Hugo Koch -- patented in 1919. Business was slow enough that the firm was reorganized at least twice in the 1920s.
There were several commercial models, and one of them was adopted by the German Navy (in a modified version) in 1926. The German Army adopted the same machine (also in a modified version somewhat different than the Navy's) a few years later.
Scherbius saw none of this as he was killed in a horse carriage accident in 1929.de:Arthur Scherbius fr:Arthur Scherbius