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Episode 711

John Speidell
Mon, 2019-Apr-15 00:42 UTC
Length - 1:54

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Welcome to random Wiki of the Day where we read the summary of a random Wikipedia page every day.

The random article for Monday, 15 April 2019 is John Speidell.

John Speidell (fl. 1600–1634) was an English mathematician. He is known for his early work on the calculation of logarithms.

Speidell was a mathematics teacher in London and one of the early followers of the work John Napier had previously done on natural logarithms. In 1619 Speidell published a table entitled "New Logarithmes" in which he calculated the natural logarithms of sines, tangents, and secants. He then diverged from Napier's methods in order to ensure all of the logarithms were positive. A new edition of "New Logarithmes" was published in 1622 and contained an appendix with the natural logarithms of all numbers 1-1000. Along with William Oughtred and Richard Norwood, Speidell helped push toward the abbreviations of trigonometric functions. Speidel published a number of work about mathematics, including An Arithmeticall Extraction in 1628.

This recording reflects the Wikipedia text as of 00:42 UTC on Monday, 15 April 2019.

For the full current version of the article, see John Speidell on Wikipedia.

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