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Mechanical Gear Number Sieve
Photograph - Photograph
Berkeley, California 1932A mechanical gear number sieve built by University of California Mathematics Professor Derrick N. Lehmer. It was used to solve number theory problems and could check 5,000 combinations per second, a record that was only beaten much later by computers in the 1960's.
February 17th, 2014
Viewed 6 Times - Last Visitor from Beverly Hills, CA on 12/26/2014 at 10:31 PM
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