Charles Babbage unveiled the Difference Engine
On this day · 14 June 1822
In a single page read to the Royal Astronomical Society, Babbage proposed grinding out error-free mathematical tables by machine.
On 14 June 1822, Charles Babbage read a one-page paper to the Royal Astronomical Society titled A note respecting the application of machinery to the calculation of astronomical tables. In it he announced the Difference Engine, a hand-cranked calculator that would automate the long, error-prone arithmetic behind navigation and astronomy tables.
The machine worked by the method of finite differences, reducing complex polynomials to repeated addition that brass gears could perform without a single human slip. Babbage’s complaint was simple: the printed tables of his day were riddled with mistakes, and he wanted a device that could not get bored.
“I wish to God these calculations had been executed by steam,” he is said to have grumbled.
The British government later poured funds into the project, yet Babbage never finished a full engine. Vindication came in 1991, when the Science Museum in London built Difference Engine No. 2 from his drawings. It worked perfectly, 169 years after he first described the idea.
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