John Pell

John Pell and the Obelus

John Pell and the Obelus

On March 1, 1611, English mathematician John Pell was born. Pell introduced the division sign (obelus, ÷) into England. The obelus was first used by Johann Rahn (1622-1676) in 1659 in Teutsche Algebra. Rahn’s book was interpreted into English and published, with additions made by John Pell. Early Years Pell was born in Southwick in Sussex, where his father of the same name, John Pell, was pastor and rector; his mother was Mary…
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William Oughtred invented the Slide Rule

William Oughtred invented the Slide Rule

On March 5, 1574, English mathematician and Anglican minister William Oughtred was born. After John Napier [3] invented logarithms, and Edmund Gunter [6] created the logarithmic scales (lines, or rules) upon which slide rules are based, it was Oughtred who first used two such scales sliding by one another to perform direct multiplication and division; and he is credited as the inventor of the slide rule in 1622. William Oughtred born at Eton, Buckinghamshire to the Rev Benjamin Oughtred,…
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