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An Lu-shan

(Encyclopedia)An Lu-shan än lo͞o-shän [key], d.757, Chinese general of the T'ang dynasty. Of mixed Sogdian and Turkish birth, he was appointed regional commander on the northeastern frontier. In 755 he led c.200...

stalactite ornament

(Encyclopedia)stalactite ornament, type of ornament characteristic of Islamic architecture. Generally executed in wood or in plaster over a wood or brick base, it consists of little vertical polygonal or curved nic...

Steward, Julian Haynes

(Encyclopedia)Steward, Julian Haynes, 1902–72, American anthropologist, b. Washington, D.C., grad. Cornell, 1925, Ph.D. Univ. of California, 1929. He taught at the Univ. of Michigan (1928–30), Columbia (1946–...

Sumner, Edwin Vose

(Encyclopedia)Sumner, Edwin Vose, 1797–1863, American soldier, Union general in the Civil War, b. Boston. He fought in the Black Hawk War and in the Mexican War. Made colonel of the 1st Cavalry in 1855, he was co...

Smithson, Robert

(Encyclopedia)Smithson, Robert, 1938–73, American sculptor, b. Passaic, N.J. After first making modular, serial sculpture, Smithson began to design large-scale earthworks (see land art) in the 1960s. Smithson res...

Aguirre, Lope de

(Encyclopedia)Aguirre, Lope de lōˈpā ᵺā agēˈrā [key], c.1510–1561, Spanish rebel and adventurer in colonial South America. He was often involved in violence and sedition before joining (1560) the expedit...

Caravaggio, Polidoro Caldara da

(Encyclopedia)Caravaggio, Polidoro Caldara da dä kärävädˈjō [key], c.1496–1543, Italian painter. His surname, Caravaggio, came from his birthplace. A student of Raphael, he was responsible for some of the ...

Beveland, North, and South Beveland

(Encyclopedia)Beveland, North, and South Beveland bāˈvəlänt [key], peninsula developed from the above former islands, Zeeland prov., SW Netherlands, in the Scheldt estuary. As a result of Dutch plans for a delt...

X-ray astronomy

(Encyclopedia)X-ray astronomy, study of celestial objects by means of the X rays they emit, in the wavelength range from 0.01 to 10 nanometers. X-ray astronomy dates to 1949 with the discovery that the sun emits X ...

Nicol prism

(Encyclopedia)Nicol prism nĭkˈəl [key], optical device invented (1828) by William Nicol of Edinburgh. It consists essentially of a crystal of calcite, or Iceland spar, that is cut at an angle into two equal piec...