The Tudor Society

March 5 – Mathematician William Oughtred

Engraving of William Oughtred along with a photo of a ring sundial, which he is thought to have invented

On this day in Tudor history, 5th March 1575, in the reign of Queen Elizabeth I, mathematician William Oughtred was baptised at Eton College, where his father, Benjamin, was registrar and writing master.

Oughtred is responsible for developing a straight slide-rule, a gauging rod and various sundials. He also introduced the "×" symbol for multiplication and the abbreviations "sin" and "cos" for the sine and cosine functions.

Let me tell you a bit more about him…

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