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atomic weight

(Encyclopedia)atomic weight, mean (weighted average) of the masses of all the naturally occurring isotopes of a chemical element, as contrasted with atomic mass, which is the mass of any individual isotope. Althoug...

Moton, Robert Russa

(Encyclopedia)Moton, Robert Russa mōˈtən [key], 1867–1940, black American educator, b. Amelia co., Va., grad. Hampton Institute, 1890. He was commandant (1890–1915) of Hampton Institute, then principal and p...

Ames, Ezra

(Encyclopedia)Ames, Ezra, 1768–1836, American painter, b. Framingham, Mass. Early in his life he worked as a carriage painter, miniaturist, engraver, and decorator, first in Worcester, Mass., and later in Albany,...

Juan Manuel, Infante de Castile

(Encyclopedia)Juan Manuel, Infante de Castile hwän mänwĕlˈ, ēnfänˈtā ᵺā kästēˈlā [key], 1282–1349?, Spanish nobleman, soldier, and writer; nephew of Alfonso X (called the Wise). Juan Manuel was a w...

Diophantus

(Encyclopedia)Diophantus dīəfănˈtəs [key], fl. a.d. 250, Greek algebraist. He pioneered in solving a type of indeterminate algebraic equation where one seeks integer values for the unknowns; work in this field...

Carr, Eugene Asa

(Encyclopedia)Carr, Eugene Asa, 1830–1910, Union general in the U.S. Civil War, b. Concord, Erie co., N.Y., grad. West Point, 1850. In the Civil War he distinguished himself at Wilson's Creek (1861) and Pea Ridge...

Branner, Hans Christian

(Encyclopedia)Branner, Hans Christian, 1903–66, Danish writer. Branner's early novels, often concerned with the irrational fears of childhood, include The Child Playing on the Shore (1937). With The Riding Master...

Simpson Desert

(Encyclopedia)Simpson Desert, c.50,000 sq mi (130,000 sq km), barren region of central Australia, predominantly in the southeastern portion of the Northern Territory, extending S into Queensland and E into South Au...

Wheeler, Wayne Bidwell

(Encyclopedia)Wheeler, Wayne Bidwell, 1869–1927, American prohibitionist and lawyer, b. Brookfield, Ohio. After his graduation (1898) from Western Reserve law school, he became increasingly important in the Ohio ...

Lawrence, Jacob

(Encyclopedia)Lawrence, Jacob (Jacob Armstead Lawrence), 1917–2000, American painter, b. Atlantic City, N.J. One of the most important African-American artists of the late 20th cent., Lawrence focused on social a...