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In the 1840s English mathematician Charles Babbage designed a mechanical computer called the Difference Engine No. 2 to calculate and print mathematical tables. His design was never built due to technological limitations. In the late 1980s a team led by Doron Swade at the Science Museum in London undertook the challenge using materials and tolerances from Babbage's era. Relying on Allan G Bromleys detailed work on Babbage's blueprints they built the calculating section in 1991 and the complete m