Babbage's Difference Engine No 2 brought to life

Built from more than 8,000 parts, the Difference Engine weighs more than five tonnes, measures 11 feet across and stands seven feet tall.

To remove room for human error in basic mathematical computations, Babbage designed the Difference Engine to calculate tables of polynomial functions to 31 decimal points. The special part of his design is that it works through addition, not multiplication.

Credit: Computer History Museum