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PIERRE BOUGUER (1698-1758)

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Originally appearing in Volume V04, Page 316 of the 1911 Encyclopedia Britannica.
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PIERRE See also:BOUGUER (1698-1758)  , See also:French mathematician, was See also:born on the 16th of See also:February 1698 . His See also:father, See also:John See also:Bouguer, one of the best hydrographers of his See also:time, was regius See also:professor of See also:hydrography at Croisic in See also:lower See also:Brittany, and author of a See also:treatise on See also:navigation . In 1713 he was appointed to succeed his father as professor of hydrography . In 1727 he gained the See also:prize given by the Academie See also:des Sciences for his See also:paper " On the best manner of forming and distributing the masts of See also:ships "; and two other prizes, one for his dissertation " On the best method of observing the See also:altitude of stars at See also:sea," the other for his paper " On the best method of observing the variation of the See also:compass at sea." These were published in the Prix de l' See also:Academic des Sciences . In 1729 he published Essai d' optique sur la gradation de la lumiere, the See also:object of which is to define the quantity of See also:light lost by passing through a given extent of the See also:atmosphere . He found the light of the See also:sun to be 300 times more intense than that of the See also:moon, and thus made some of the earliest measurements in See also:photometry . In 1730 he was made professor of hydrography at See also:Havre, and succeeded P . L . M. de See also:Maupertuis as See also:associate geometer of the Academic des Sciences . He also invented a See also:heliometer, afterwards perfected by See also:Fraunhofer . He was afterwards promoted in the See also:Academy to the See also:place of Maupertuis, and went to reside in See also:Paris . In 1735 Bouguer sailed with C .

M. de la Condamine for See also:

Peru, in See also:order to measure a degree of the See also:meridian near the See also:equator . Ten years were spent in this operation, a full See also:account of which was published by Bouguer in 1749, Figure de la terre determinee . His later writings were nearly all upon the theory of navigation . He died on the 15th of See also:August 1758 . The following is a See also:list of his See also:principal See also:works:—Traite d'optique sur la gradation de la lumiere (1729 and 176o) Entretiens sur la cause d'inclinaison des orbites des planetes (1734) ; Traite de navire, &c . (1746, 4to); La Figure de la terre determinee, &'c . (1749), 4to; Nouveau traite de navigation, contenant la theorie et la pratique du pilotage (1753); See also:Solution des principaux problemes sur la manoeuvre des vaisseaux (1757); Operations faites pour la verification du degre du meridien entre Paris et See also:Amiens, See also:par See also:Mess . Bouguer, See also:Camus, See also:Cassini et Pingre (1757) . See J . E . See also:Montucla, Histoire des mathematiques (1802) .

End of Article: PIERRE BOUGUER (1698-1758)
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ADOLPHE WILLIAM BOUGUEREAU (1825-1905)

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