William Oughtred (1574 - 1660) was an English mathematician and scholar. He used previous work by Napier, Gunter, and Delamain design a circular slide rule. This made approximate calculations much easier and faster than other methods of the time. The slide rule was reinvented in a sliding bar format in the 1650s. In addition to making calculations easier, the slide rule made teaching of logarithms more understandable.
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The word "ought" is in the King James Version of the Bible 97 times. It is in 94 verses.
One syllable. :)
It has one syllable.
Laughable. Something which ought to be laughed at.
Empirical anything is what is observed. Theoretical is a calculation of what things ought to be.