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Foucault, Jean Bernard Léon

(Encyclopedia)Foucault, Jean Bernard Léon zhäN bĕrnärˈ lāôNˈ fo͞okōˈ [key], 1819–68, French physicist. Known especially for his research on the speed of light, he determined its velocity in air and fou...

Ingres, Jean Auguste Dominique

(Encyclopedia)Ingres, Jean Auguste Dominique zhäN ōgüstˈ dômēnēkˈ ăNˈgrə [key], 1780–1867, French painter, b. Montauban; son of a sculptor. He studied with J. L. David in Paris and in 1801 won the Prix...

Houdin, Jean Eugène Robert

(Encyclopedia)Houdin, Jean Eugène Robert or Jean Eugène Robert-Houdin zhäN özhĕnˈ rōbĕrˈ o͞odăNˈ [key], 1805–71, French conjurer and magician. Originally a clockmaker, he was celebrated for his optica...

Joinville, Jean, sire de

(Encyclopedia)Joinville, Jean, sire de zhäN sēr də zhwăNvēlˈ [key], 1224?–1317?, French chronicler, biographer of Louis IX of France (St. Louis). As seneschal (governor) of Champagne, Joinville was a close ...

Duvergier de Hauranne, Jean

(Encyclopedia)Duvergier de Hauranne, Jean zhäN düvĕrzhyāˈ də ōränˈ [key], 1581–1643, French theologian. He is often called the Abbé de Saint-Cyran from an abbacy he held in commendam (i.e., received the...

Delambre, Jean Baptiste Joseph

(Encyclopedia)Delambre, Jean Baptiste Joseph zhäN bätēstˈ zhôzĕfˈ dəläNˈbrə [key], 1749–1822, French astronomer and mathematician. He was a member of the bureau of longitudes from 1795 and professor at...

De Smet, Pierre Jean

(Encyclopedia)De Smet, Pierre Jean pyĕr zhäN də smĕtˈ [key], 1801–73, Jesuit missionary in the U.S. Pacific Northwest, b. Belgium. He emigrated to the United States in 1821, served his novitiate in Florissan...

Detaille, Jean Baptiste Édouard

(Encyclopedia)Detaille, Jean Baptiste Édouard zhäN bäptēstˈ ādwärˈ dətäyˈ [key], 1848–1912, French painter. He studied under J. L. E. Meissonier and served in the Franco-Russian war. From this backgrou...

Dumas, Jean Baptiste André

(Encyclopedia)Dumas, Jean Baptiste André dümäˈ [key], 1800–1884, French organic chemist. He was distinguished for his researches on atomic weights, esters, vapor densities, the oxidation products of alcohols...

Dunois, Jean, comte de

(Encyclopedia)Dunois, Jean, comte de zhäN kôNt də dünwäˈ [key], c.1403–1468, French general, called the Bastard of Orléans; natural son of Louis, duc d'Orléans. He joined the Armagnacs in the civil war du...