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focus

(Encyclopedia)focus, in optics, the point at which rays converge after reflection by a concave mirror or refraction by a convex lens, also known as a real focus. The point from which rays appear to diverge after re...

Redstone Arsenal

(Encyclopedia)Redstone Arsenal, U.S. rocket research and development center, 38,781 acres (15,694 hectares), N Ala., W of Huntsville; est. 1941. One of the state's largest industrial enterprises, it includes the Ar...

Puerto Rico, University of

(Encyclopedia)Puerto Rico, University of, main campus at Río Piedras, near San Juan; land-grant and commonwealth; coeducational; founded 1903 as successor to a normal school. The Río Piedras campus has faculties ...

Houston Grand Opera

(Encyclopedia)Houston Grand Opera, opera company in Houston, Tex., founded 1955 by the German-American impresario and conductor Walter Herbert, who was general director and conductor until 1972. The company perform...

Stadion, Johann Philipp, Graf von

(Encyclopedia)Stadion, Johann Philipp, Graf von yōˈhän fēˈlĭp gräf fən shtäˈdēôn [key], 1763–1824, Austrian politician. A diplomat, he was made (1805) foreign minister and campaigned for a German upri...

Swanson, Claude Augustus

(Encyclopedia)Swanson, Claude Augustus, 1862–1939, American politician, b. Pittsylvania co., Va. He practiced law in Chatham, Va., and after serving (1893–1905) in the U.S. House of Representatives he was (1906...

CARE

(Encyclopedia)CARE (Cooperative for Assistance and Relief Everywhere), nonprofit, nonsectarian federation of agencies devoted to channeling relief and self-help materials to needy people in foreign countries. Organ...

quadrant, in analytic geometry

(Encyclopedia)quadrant. 1 In analytic geometry, one of the four regions of the plane determined by two lines, the x-axis and the y-axis. Commonly these lines are drawn perpendicular to each other, and the quadrants...

Paz Estenssoro, Victor

(Encyclopedia)Paz Estenssoro, Victor vēktōrˈ päs āstānsōˈrō [key], 1907–2001, president of Bolivia (1952–56, 1960–64, 1985–89). An attorney and economist born into a land-owning family, he was a fo...

Tillman, Benjamin Ryan

(Encyclopedia)Tillman, Benjamin Ryan, 1847–1918, U.S. Senator from South Carolina (1895–1918), b. Edgefield co., S.C. A farmer, he became the leader of the backcountry whites in South Carolina and fostered thei...