What Happened on January 21st

Fragment of Babbage's Difference Engine
Fragment of Babbage's Difference Engine
 
Babbage's Analytical Engine Passes the First Test
The Analytical Engine of Charles Babbage was never completed in his lifetime, but his son Henry Provost Babbage built the mill portion of the machine from his father's drawings, and on January 21, 1888, computed multiples of pi to prove the adequacy of the design. Perhaps this represents the first successful test of a portion of a modern computer. Recently a portion of his earlier machine, the Difference Engine, was sold at auction by Christie's of London to the Powerhouse Museum in Sydney, Australia.