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thyristor

(Encyclopedia)thyristor, semiconductor switch used chiefly in power-control applications. Also called a silicon-controlled rectifier (SCR; see rectifier), it is a variation of the transistor. A thyristor is capable...

Congreve, William

(Encyclopedia)Congreve, William, 1670–1729, English dramatist, b. near Leeds, educated at Trinity College, Dublin, and studied law in the Middle Temple. After publishing a novel of intrigue, Incognita (1692), and...

Ono, Yoko

(Encyclopedia) Ono, Yoko, 1933- , Japanese-American conceptual artist, songwriter, and recording artist, b. Tokyo, Japan. Ono’s father was a banker and her mother ...

Spark, Dame Muriel

(Encyclopedia)Spark, Dame Muriel, 1918–2006, Scottish novelist, b. Muriel Sarah Camberg. She lived in Edinburgh, Rhodesia (now Zimbabwe), London, New York, and Rome, and spent her last years in Tuscany. Spark's t...

winch

(Encyclopedia)winch, mechanical device for hauling or lifting consisting essentially of a movable drum around which a cable is wound so that rotation of the drum produces a drawing force at the end of the cable. A ...

Niagara Falls, waterfall, United States and Canada

(Encyclopedia)Niagara Falls, in the Niagara River, W N.Y. and S Ont., Canada; one of the most famous spectacles in North America. The falls are on the international line between the cities of Niagara Falls, N.Y., a...

Reclamation, United States Bureau of

(Encyclopedia)Reclamation, United States Bureau of, agency set up in the Dept. of the Interior under the Reclamation Act of 1902. It is charged with promoting regional economies by developing water and related land...

Columbia basin project

(Encyclopedia)Columbia basin project, central Wash., a multipurpose development of the U.S. Bureau of Reclamation providing irrigation, hydroelectric power, and flood control. Its key unit, the Grand Coulee Dam, pr...

Moore, Barrington

(Encyclopedia)Moore, Barrington, 1913–2005, American sociologist and political scientist. Moore wrote a number of books on historical sociology that focus on Soviet society. Based at the Russian Research Center a...

Schleicher, Kurt von

(Encyclopedia)Schleicher, Kurt von, 1882–1934, German general. A leading Reichswehr (army) figure after World War I, Schleicher wielded great power in the years before Adolf Hitler came to power (1933). He was wa...