# Napier (Neper), John

**SUBJECT AREA:**Electronics and information technology[br]b. 1550 Merchiston Castle, Edinburgh, Scotlandd. 4 April 1617 Merchiston Castle, Edinburgh, Scotland[br]*Scottish mathematician and theological writer noted for his discovery of logarithms, a powerful aid to mathematical calculations.*[br]Born into a family of Scottish landowners, at the early age of 13 years Napier went to the University of St Andrews in Fife, but he apparently left before taking his degree. An extreme Protestant, he was active in the struggles with the Roman Catholic Church and in 1594 he dedicated to James VI of Scotland his*Plaine Discovery of the Whole Revelation of St John*, an attempt to promote the Protestant case in the guise of a learned study. About this time, as well as being involved in the development of military equipment, he devoted much of his time to finding methods of simplifying the tedious calculations involved in astronomy. Eventually he realized that by representing numbers in terms of the power to which a "base" number needed to be raised to produce them, it was possible to perform multiplication and division and to find roots, by the simpler processes of addition, substraction and integer division, respectively.A description of the principle of his "logarithms" (from the Gk.*logos*, reckoning, and*arithmos*, number), how he arrived at the idea and how they could be used was published in 1614 under the title*Mirifici Logarithmorum Canonis Descriptio*. Two years after his death his*Mirifici Logarithmorum Canonis Constructio*appeared, in which he explained how to calculate the logarithms of numbers and gave tables of them to eight significant figures, a novel feature being the use of the decimal point to distinguish the integral and fractional parts of the logarithm. As originally conceived, Napier's tables of logarithms were calculated using the natural number*e*(=2.71828…) as the base, not directly, but in effect according to the formula: Naperian log*x*= 107(log e 107-log e*x*) so that the original Naperian logarithm of a number decreased as the number increased. However, prior to his death he had readily acceded to a suggestion by Henry**Briggs**that it would greatly facilitate their use if logarithms were simply defined as the value to which the decimal base 10 needed to be raised to realize the number in question. He was almost certainly also aware of the work of Joost**Burgi**.No doubt as an extension of his ideas of logarithms, Napier also devised a means of manually performing multiplication and division by means of a system of rods known as Napier's Bones, a forerunner of the modern slide-rule, which evolved as a result of successive developments by Edmund Gunther, William Oughtred and others. Other contributions to mathematics by Napier include important simplifying discoveries in spherical trigonometry. However, his discovery of logarithms was undoubtedly his greatest achievement.[br]__Bibliography__Napier's*"Descriptio"*and his*"Constructio"*were published in English translation as*Description of the Marvelous Canon of Logarithms*(1857) and W.R.MacDonald's*Construction of the Marvelous Canon of Logarithms*(1889), which also catalogues all his works. His*Rabdologiae, seu Numerationis per Virgulas Libri Duo*(1617) was published in English as*Divining Rods, or Two Books of Numbering by Means of Rods*(1667).__Further Reading__D.Stewart and W.Minto, 1787,*An Account of the Life Writings and Inventions of John Napier of Merchiston*(an early account of Napier's work).C.G.Knott (ed.), 1915,*Napier Tercentenary Memorial Volume*(the fullest account of Napier's work).__KF__

*Biographical history of technology. - Taylor & Francis e-Librar.
Lance Day and Ian McNeil.
2005.*

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**Neper, John**— See: Napier, John … Biographical history of technology**John Napier**— Con la reducción del trabajo de varios meses de cálculo a unos pocos días, el invento de los logaritmos parece haber duplicado la vida de los astrónomos. Pierre Simon Laplace. John Napier (Neper). John Napier (Neper), barón de Merchiston… … Wikipedia Español**John Neper**— John Napier John Napier John Napier (auch latinisiert Neper), Laird of Merchiston (* 1550 in Merchiston Castle bei Edinburgh; † 3. April 1617 in Merchiston Castle) war e … Deutsch Wikipedia**John Napier**— John Napier (auch latinisiert Neper) … Deutsch Wikipedia**Neper (crater)**— Coordinates 8°48′N 84°30′E / 8.8°N 84.5°E / … Wikipedia**Napier**— may refer to: Contents 1 People 2 Places 2.1 Antarctica 2.2 … Wikipedia**Napier**— (Neper) (izg. nèipier), John (1550 1617) DEFINICIJA škotski matematičar; radove u trigonometriji (Napierove analogije) zasjenilo njegovo otkriće prirodnih logaritama; prvi sastavio logaritamske tablice … Hrvatski jezični portal**John Napier**— For other people with the same name, see John Napier (disambiguation). John Napier John Napier (1550–1617) Born … Wikipedia**Napier**— I Napier [ neɪpɪə], Hafenstadt an der Ostküste der Nordinsel Neuseelands, an der Hawke Bay, 52 500 Einwohner, als städtische Agglomeration Napier Hastings 113 700 Einwohner; Kunstgalerie, Völkerkundemuseum, botanischer Garten; Wollhandel,… … Universal-Lexikon**Napier**— /nay pee euhr/ or, for 1 3, /neuh pear /, n. 1. Sir Charles James, 1782 1853, British general. 2. Also, Neper. John, 1550 1617, Scottish mathematician: inventor of logarithms. 3. Robert Cornelis /kawr nee lis/, (1st Baron Napier of Magdala), 1810 … Universalium