An early calculator designed by Charles Babbage ... failed its test in 1833. Babbage then turned his attention to the Analytical Engine and completely abandoned the Difference Engine by 1842.

Charles Babbage 17911871 computer pioneer designed the first automatic computing engines He invented computers but failed to build them The first complete Babbage Engine was completed in London in ...

English engineer Charles Babbage ... designs in the coming centuries. Babbage's machines include a mechanical calculator called the "Difference Engine" which started its development in 1823 ...