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Today is William Oughtred's Birthday!
Happy Birthday

Born:  March 5, 1574
in Eton, England

Died:  June 30, 1660
in Albury, England

Oughtred was the inventor of the slide rule, a mechanical device employing sliding logarithmic scales that was used for hundreds of years to speed up arithmetical computations. The slide rule became obsolete in the 1970s, due to the introduction of inexpensive electronic handheld calculators.