English mathematician Charles Babbage was tired of typographical errors in his books of mathematical tables. These books had lists of pre-computed numbers, which were used in navigation, astronomy, and statistics. Babbage drew up the design for the Difference Engine, a mechanical calculator that could produce these tables automatically. While his design was good, the engine was very expensive to make.

**“At each increase of knowledge… human labour becomes abridged.” Charles Babbage (1791–1871), English mathematician and inventor.**