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274:... shook me kindly by the hand, bid me be seated, and took his seat near me. He is now between 60 and 70 years old, with silver silken hair neatly arranged on a fine intelligent head. He is tall and thin, but although he now stoops with age and feebleness one can see that one time his figure was more than ordinarily graceful. He was loosely but neatly dressed in a large ample robe de chambre. His features are finely moulded â indeed everything about the man betokens good blood. He talks incessantly and well. I did not misunderstand a word, although he spoke always in a low tone, and now and then his voice dropped as if from weariness, but he never wandered from his point...
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220:. On 1 November 1809, Poinsot became assistant professor of analysis and mechanics at his old school the Ăcole Polytechnique. During this period of transitions between schools and work, Poinsot had remained active in research and published a number of works on geometry, mechanics and statics so that by 1809 he had an excellent reputation.
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Poinsot was the inventor of geometrical mechanics, which showed how a system of forces acting on a rigid body could be resolved into a single force and a couple. Previous work done on the motion of a rigid body had been purely analytical with no visualization of the motion, and the great value of the
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Everyone makes for himself a clear idea of the motion of a point, that is to say, of the motion of a corpuscle which one supposes to be infinitely small, and which one reduces by thought in some way to a mathematical point.
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486:, regained geometry's leading role in mathematical research in France in the 19th century. Poinsot also contributed to the importance of geometry by creating a chair of advanced geometry at the
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309:"Poinsot was determined to publish only fully developed results and to present them with clarity and elegance. Consequently he left a rather limited body of work ..."
471:'s work of 1619, although Poinsot was unaware of this. The other two are the great icosahedron and great dodecahedron, which some people call these two the
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Poinsot thus left the Ăcole des Ponts et ChaussĂ©es and civil engineering to become a mathematics teacher at the secondary school
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by J J O'Connor and E F Robertson, School of
Mathematics and Statistics, University of St Andrews, Scotland
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it enables us to represent to ourselves the motion of a rigid body as clearly that as a moving point
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on the moon is named after
Poinsot. A street in Paris is called Rue Poinsot (14th Arrondissement).
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By 1812 Poinsot was no longer directly teaching at Ăcole
Polytechnique using substitute teacher
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section but was still accepted. A student there for two years, he left in 1797 to study at
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396:(EncyclopĂŠdia Britannica, 1911). In particular, he devised what is now known as
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memoirs that dealt with the composition of moments and the composition of areas
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in Paris, from 1804 to 1809. From there he became inspector general of the
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611:. Vol. 21 (11th ed.). Cambridge University Press. p. 892.
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This article incorporates text from a publication now in the
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for secondary preparatory education for entrance to the famous
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in 1858. He died in Paris on 5 December 1859. He is buried in
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the general theory of equilibrium and of movements in systems
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The grave of Louis
Poinsot, Pere Lachaise Cemetery, Paris
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in 1813, Poinsot was elected to fill his place at the
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536:, Cambridge UP, 4th edition, (1938), p. 152 ff.
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533:Analytical Dynamics of Particles and Rigid Bodies
313:âDictionary of Scientific Biography (see Sources)
120:; 3 January 1777 â 5 December 1859) was a French
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467:in 1809. Two of these had already appeared in
16:French mathematician and physicist (1777â1859)
434:). He proved that the endpoint of the vector
181:on 3 January 1777. He attended the school of
564:Taton, RenĂ© (1970â1980). "Poinsot, Louis".
494:which he occupied until his death in 1880.
243:from 1839 until his death. On the death of
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675:Members of the French Academy of Sciences
478:Poinsot worked on number theory studying
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368:Théorie nouvelle de la rotation des corps
352:Theorie nouvelle de la rotation des corps
295:on plaques around the first stage of the
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490:in 1846. Poinsot created the chair for
460:(in absolute space) of the rigid body.
456:moves in a plane perpendicular to the
293:72 names of prominent French scientists
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680:Foreign members of the Royal Society
551:Discours aux funérailles de Poinsot
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655:19th-century French mathematicians
567:Dictionary of Scientific Biography
449:{\displaystyle \mathbf {\omega } }
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512:The elements of statics - Part 1
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670:Lycée Louis-le-Grand alumni
291:included Poinsot among the
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558:Notice sur Louis Poinsot
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463:He discovered the four
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324:Eléments de statique
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203:abstract mathematics
183:Lycée Louis-le-Grand
556:Bertrand, J. L. F.
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279:Legacy and tributes
187:Ăcole Polytechnique
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89:Institutions
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650:1859 deaths
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629:Rue Poinsot
283:The crater
130:geometrical
60:Nationality
639:Categories
498:References
428:rigid body
263:in Paris.
623:Biography
443:ω
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133:mechanics
126:physicist
488:Sorbonne
218:Delambre
631:, Paris
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544:Sources
492:Chasles
404:vector
285:Poinsot
233:Reynaud
191:algebra
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469:Kepler
386:(1852)
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141:couple
139:and a
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572:ISBN
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147:Life
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