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'''John Speidell''' ([[floruit|fl.]] 1600–1634) was an English mathematician. He is known for his early work on the calculation of logarithms.
{{AFC submission|d|bio|u=Jctobin8|ns=118|decliner=Worldbruce|declinets=20150328013934|ts=20150318202457}} <!-- Do not remove this line! -->


Speidell was a mathematics teacher in London<ref name="AubreyClark1898">{{cite book|author1=John Aubrey|author2=Andrew Clark|title='Brief Lives': I-Y|url=https://archive.org/details/brieflives01clargoog|year=1898|publisher=At the Clarendon Press|pages=[https://archive.org/details/brieflives01clargoog/page/n258 230]–231}}</ref><ref name="DownesBold1993">{{cite book|author1=Kerry Downes|author2=John F. Bold|author3=Edward Chaney|author3-link=Edward Chaney|title=English Architecture Public & Private: Essays for Kerry Downes|url=https://books.google.com/books?id=0UCQl0ocbZMC&pg=PA28|year=1993|publisher=A&C Black|isbn=978-1-85285-095-1|pages=28–}}</ref> and one of the early followers of the work [[John Napier]] had previously done on [[natural logarithms]].<ref name="Hobson2012">{{cite book|author=E. W. Hobson|title=John Napier and the Invention of Logarithms, 1614: A Lecture by E.W. Hobson|url=https://books.google.com/books?id=YGa37Bay6NgC&pg=PA43|date=29 March 2012|publisher=Cambridge University Press|isbn=978-1-107-62450-4|pages=43–}}</ref> In 1619 Speidell published a table entitled "New Logarithmes" in which he calculated the natural logarithms of sines, tangents, and secants.<ref name="Hutton1785">{{cite book|author=Charles Hutton|title=Mathematical Tables, Containing Common, Hyperbolic and Logistic Logarithms, Also Sines Tangents, Secants and Versed Sines, Both Natural and Logarithmic|url=https://books.google.com/books?id=AhYPAAAAQAAJ&pg=PA30|year=1785|publisher=Robinson and Baldwin|pages=30–}}</ref><ref name="Cajori2013">{{cite book|author=Florian Cajori|title=A History of Mathematical Notations|url=https://books.google.com/books?id=_byqAAAAQBAJ&pg=RA1-PA157|date=26 September 2013|publisher=Courier Corporation|isbn=978-0-486-16116-7|pages=1–}}</ref>
{{AFC comment|1=The basic notability criteria for people is significant coverage in multiple independent, reliable, secondary sources. Cajori is a good source, but cannot on its own establish notability. Even if able to find additional similar independent sources, from what Cajori writes it's unlikely that a stand alone article on Speidell would be justified. He appears destined to be a footnote in history. [[User:Worldbruce|Worldbruce]] ([[User talk:Worldbruce|talk]]) 01:39, 28 March 2015 (UTC)}}


He then diverged from Napier's methods in order to ensure all of the logarithms were positive.<ref name="Brewster1819">{{cite book|author=Sir David Brewster|title=Second American edition of the new Edinburgh encyclopædia|url=https://books.google.com/books?id=1W9UAAAAYAAJ&pg=PA112|year=1819|publisher=Published by Samuel Whiting and John L. Tiffany; also, by N. Whiting, New-Haven; A. Seward, Utica; S. Parker, Philadelphia; Wm. Snodgrass, Natchez; and I. Clizbe, New-Orleans 1819.|pages=112–}}</ref> A new edition of "New Logarithmes" was published in 1622 and contained an appendix with the natural logarithms of all numbers 1-1000.<ref name="Cajori1893">{{cite book|author=Florian Cajori|title=A History of Mathematics|url=https://archive.org/details/ahistorymathema00cajogoog|year=1893|publisher=Macmillan & Company|pages=[https://archive.org/details/ahistorymathema00cajogoog/page/n186 165]–}}</ref>
----


Along with [[William Oughtred]] and [[Richard Norwood]], Speidell helped push toward the abbreviations of [[trigonometric functions]].<ref name="Cajori1893" />
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'''John Speidell''' (fl. 1600–1634)<ref>{{cite web|url=http://en.wikisource.org/wiki/Author:John_Speidell|title=John Speidell}}</ref> was an English mathematician.


Speidel published a number of work about mathematics, including ''An Arithmeticall Extraction'' in 1628.<ref name="Morgan1847">{{cite book|author=Augustus De Morgan|title=Arithmetical Books from the Invention of Printing to the Present Time: Being Brief Notices of a Large Number of Works Drawn Up from Actual Inspection|url=https://books.google.com/books?id=YSUQAAAAYAAJ&pg=PA37|year=1847|publisher=Taylor and Walton|pages=37–}}</ref> His son, [[Euclid Speidell]], also published mathematics texts.<ref>{{cite journal |last1=Beeley |first1=Philip |title=Practical mathematicians and mathematical practice in later seventeenth-century London |journal=The British Journal for the History of Science |date=June 2019 |volume=52 |issue=2 |pages=225–248 |doi=10.1017/S0007087419000207|pmid=31198123 |doi-access= }}</ref>
== Biography ==
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.<ref>{{cite book|last1=Cajori|first1=Florian|title=A History of Mathematics|date=1919|publisher=Macmillan|pages=152-153|url=https://play.google.com/store/books/details?id=bBoPAAAAIAAJ&rdid=book-bBoPAAAAIAAJ&rdot=1|accessdate=March 18, 2015}}</ref>

Along with [[William Oughtred]] and [[Richard Norwood]], Speidell helped push toward the abbreviations of [[trigonometric functions]].<ref>{{cite book|last1=Cajori|first1=Florian|title=A History of Mathematics|date=1919|publisher=Macmillan|page=158|url=https://play.google.com/store/books/details?id=bBoPAAAAIAAJ&rdid=book-bBoPAAAAIAAJ&rdot=1|accessdate=March 18, 2015}}</ref>


== References ==
== References ==
{{reflist}}
{{Reflist}}

{{Authority control}}

{{DEFAULTSORT:Speidell, John}}
[[Category:16th-century births]]
[[Category:17th-century deaths]]
[[Category:17th-century English mathematicians]]

Latest revision as of 03:09, 19 August 2023

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[1][2] and one of the early followers of the work John Napier had previously done on natural logarithms.[3] In 1619 Speidell published a table entitled "New Logarithmes" in which he calculated the natural logarithms of sines, tangents, and secants.[4][5]

He then diverged from Napier's methods in order to ensure all of the logarithms were positive.[6] A new edition of "New Logarithmes" was published in 1622 and contained an appendix with the natural logarithms of all numbers 1-1000.[7]

Along with William Oughtred and Richard Norwood, Speidell helped push toward the abbreviations of trigonometric functions.[7]

Speidel published a number of work about mathematics, including An Arithmeticall Extraction in 1628.[8] His son, Euclid Speidell, also published mathematics texts.[9]

References

[edit]
  1. ^ John Aubrey; Andrew Clark (1898). 'Brief Lives': I-Y. At the Clarendon Press. pp. 230–231.
  2. ^ Kerry Downes; John F. Bold; Edward Chaney (1993). English Architecture Public & Private: Essays for Kerry Downes. A&C Black. pp. 28–. ISBN 978-1-85285-095-1.
  3. ^ E. W. Hobson (29 March 2012). John Napier and the Invention of Logarithms, 1614: A Lecture by E.W. Hobson. Cambridge University Press. pp. 43–. ISBN 978-1-107-62450-4.
  4. ^ Charles Hutton (1785). Mathematical Tables, Containing Common, Hyperbolic and Logistic Logarithms, Also Sines Tangents, Secants and Versed Sines, Both Natural and Logarithmic. Robinson and Baldwin. pp. 30–.
  5. ^ Florian Cajori (26 September 2013). A History of Mathematical Notations. Courier Corporation. pp. 1–. ISBN 978-0-486-16116-7.
  6. ^ Sir David Brewster (1819). Second American edition of the new Edinburgh encyclopædia. Published by Samuel Whiting and John L. Tiffany; also, by N. Whiting, New-Haven; A. Seward, Utica; S. Parker, Philadelphia; Wm. Snodgrass, Natchez; and I. Clizbe, New-Orleans 1819. pp. 112–.
  7. ^ a b Florian Cajori (1893). A History of Mathematics. Macmillan & Company. pp. 165–.
  8. ^ Augustus De Morgan (1847). Arithmetical Books from the Invention of Printing to the Present Time: Being Brief Notices of a Large Number of Works Drawn Up from Actual Inspection. Taylor and Walton. pp. 37–.
  9. ^ Beeley, Philip (June 2019). "Practical mathematicians and mathematical practice in later seventeenth-century London". The British Journal for the History of Science. 52 (2): 225–248. doi:10.1017/S0007087419000207. PMID 31198123.
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