Answer:
Charles Babbage (1791-1871), computer pioneer, designed two classes of engine, Difference Engines, and Analytical Engines. Difference engines are so called because of the mathematical principle on which they are based, namely, the method of finite differences.
Explanation:
Difference Engine, an early calculating machine, verging on being the first computer, designed and partially built during the 1820s and '30s by Charles Babbage.
