See also:born at
See also:Metz on the 1st of
See also:July 1788 . From 1808 to 18ro he attended the Ecole polytechnique, and afterwards, till 1812, the Ecole d'application at Metz . He then became
See also:lieutenant of
See also:engineers, and took
See also:part in the
See also:campaign, during which he was taken prisoner and was confined at
See also:Saratov on the
See also:Volga . It was during his imprisonment here that, " prive de toute espece de livres et de secours, surtout distrait
See also:les malheurs de ma patrie et les miens propres," as he himself puts it, he began his researches on projective
See also:geometry which led to his
See also:treatise on that subject . This
See also:work, the Traite
See also:des propeittes projectives des figures, which was published in 1822 (2d ed., 2 vols . 1865-1866), is occupied with the investigation of the projective properties of figures (see GEOMETRY) . This work entitles
See also:Poncelet to
See also:rank as one of the greatest of those who took part in the development of the
See also:modern geometry of which G .
See also:Monge was the founder . From 1815 to 1825 he was occupied with military
See also:engineering at Metz; and from 1825 to 1835 he was
See also:professor of
See also:mechanics at the Ecole d'application there . In 1826, in his Memoire sur les roues hydrauliques d aubes courbes, he brought forward improvements in the construction of
See also:water-wheels, which more than doubled their efficiency . In 1834 he became a member of the Academie; from 1838 to 1848 he was professor to the
See also:faculty of sciences at
See also:Paris,. and from 1848 to 185o commandant of the Ecole polytechnique . At the
See also:Exhibition of 1851 he had
See also:charge of the department of machinery, and wrote a
See also:report on the machinery and tools on view at that exhibition .
He died at Paris on the 23rd of
See also:December 1867 . See J . Bertrand, Eloge historique de Poncelet (Paris, 1875) .
ETIENNE DE PONCHER (1446-1524)
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