Working version of Charles Babbage's Difference Engine

Science Museum curator Dolon Swade has spent the past 15 years completing a working version of Charles Babbage's Difference Engine and Printer from the pioneer's paper designs. It can compute each value of a mathematical table to 30 decimal places every six seconds and print out the results in columns using two fonts simultaneously. The machine is 11ft long, 7ft wide, weighs five tonnes and contains 8,000 parts.

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