Difference engine

Difference engine is a calculator that was thought up by Charles Babbage.

Difference Engine Media

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  The London Science Museum's difference engine, the first one built from Babbage's design. It has the same precision on all columns, except in calculating polynomials, the precision on the higher-order columns could be lower.

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  Per Georg Scheutz's third difference engine, in the Science Museum, London

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  Fully operational difference engine at the Computer History Museum in Mountain View, California

• The Mountain View machine in action