Online Encyclopedia

Search over 40,000 articles from the original, classic Encyclopedia Britannica, 11th Edition.

SIR JAMES IVORY (1765-1842)

Online Encyclopedia
Originally appearing in Volume V15, Page 92 of the 1911 Encyclopedia Britannica.
Spread the word: del.icio.us del.icio.us it!

See also:

SIR See also:JAMES See also:IVORY (1765-1842)  , Scottish mathematician, was See also:born in See also:Dundee in 1765 . In 1779 he entered the university of St See also:Andrews, distinguishing himself especially in See also:mathematics . He then studied See also:theology; but, after two sessions at St Andrews and one at See also:Edinburgh, he abandoned all See also:idea of the See also:church, and in 1786 he became an assistant-teacher of mathematics and natural philosoghy in a newly established See also:academy at Dundee . Three years later he became partner in and manager of a See also:flax-See also:spinning See also:company at Douglastown in See also:Forfarshire, still, however, prosecuting in moments of leisure his favourite studies . He was essentially a self-trained mathematician, and was not only deeply versed in See also:ancient and See also:modern See also:geometry, but also had a full knowledge of the See also:analytical methods and discoveries of the See also:continental mathematicians . His earliest memoir, dealing with an analytical expression for the rectification of the See also:ellipse, is published in the Transactions of the Royal Society of Edinburgh (1796); and this and his later papers on " Cubic Equations " (1799) and " See also:Kepler's Problem " (1802) evince See also:great facility in the handling of algebraic formulae . In 1804 after the See also:dissolution of the flax-spinning company of which he was manager, he obtained one of the mathematical chairs in the Royal Military See also:College at See also:Marlow (afterwards removed to See also:Sandhurst); and till the See also:year 1816, when failing See also:health obliged him to resign, he discharged his professional duties with remarkable success . During this See also:period he published in the Philosophical Transactions several important See also:memoirs, which earned for him the See also:Copley See also:medal in 1814 and ensured his See also:election as a See also:Fellow of the Royal Society in 1815 . Of See also:special importance in the See also:history of attractions is the first of these earlier memoirs (Phil . Trans., 1809), in which the problem of the attraction of a homogeneous See also:ellipsoid upon an See also:external point is reduced to the simpler See also:case of the attraction of another but related ellipsoid upon a corresponding point interior to it . This theorem is known as See also:Ivory's theorem . His later papers in the Philosophical Transactions treat of astronomical refractions, of planetary perturbations, of See also:equilibrium of fluid masses, &c .

For his investigations in the first named of these he received a royal medal in 1826 and again in 1839 . In 1831, on the recommendation of See also:

Lord See also:Brougham, See also:King See also:William IV. granted him a See also:pension of £300 per annum, and conferred on him the Hanoverian Guelphic See also:order of See also:knighthood . Besides being directly connected with the See also:chief scientific See also:societies of his own See also:country, the Royal Society of Edinburgh, the Royal Irish Academy, &c., he was corresponding member of the Royal Academy of Sciences both of See also:Paris and See also:Berlin, and of the Royal Society of See also:Gottingen . He died at See also:London on the 21st of See also:September 1842 . A See also:list of his See also:works is given in the See also:Catalogue of Scientific Papers of the Royal Society of London .

End of Article: SIR JAMES IVORY (1765-1842)
[back]
IVORY COAST (Cote d'Ivoire)
[next]
IVREA (anc. Eporedia)

Additional information and Comments

There are no comments yet for this article.
» Add information or comments to this article.
Please link directly to this article:
Highlight the code below, right click and select "copy." Paste it into a website, email, or other HTML document.