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hydraulic machine

(Encyclopedia)CE5 Hydraulic pressure: In any hydraulic device the pressure exerted by one piston is transmitted throughout the fluid. Since pressure equals force divided by area, a small force (F1) exerted on a ...

Atomic Energy Commission

(Encyclopedia)Atomic Energy Commission (AEC), former U.S. government commission created by the Atomic Energy Act of 1946 and charged with the development and control of the U.S. atomic energy program following Worl...

Lumet, Sidney

(Encyclopedia)Lumet, Sidney lo͞o-mĕtˈ [key], 1924–2011, one of the great American film directors of the 20th cent., b. Philadelphia. A child actor in New York's Yiddish radio and theater and (1935–41) on Bro...

Mitchell, Joni

(Encyclopedia)Mitchell, Joni, 1943–, Canadian-American songwriter, singer, guitarist, poet, and painter, b. MacLeod (now Fort Macleod), Alta., as Roberta Joan Ander...

Xenophon

(Encyclopedia)Xenophon zĕnˈəfən [key], c.430 b.c.–c.355 b.c., Greek historian, b. Athens. He was one of the well-to-do young disciples of Socrates before leaving Athens to join the Greek force (the Ten Thousa...

Jarrett, Keith

(Encyclopedia) Jarrett, Keith , 1945- , American jazz pianist and composer, b. Allentown, Pa. A child prodigy on the piano, Jarrett was exposed to contemporary jazz d...

New Democratic party

(Encyclopedia)New Democratic party (NDP), Canadian political party, founded in 1961 when the Cooperative Commonwealth Federation (CCF) reorganized itself and entered into close ties with Canadian labor unions, espe...

Reform party, in the United States

(Encyclopedia)Reform party, in the United States, political party founded in 1995 by H. Ross Perot as an alternative to the Democratic and Republican parties. The Reform party's aims originally included mandating h...

playing cards

(Encyclopedia)playing cards, parts of a set or deck, used in playing various games of chance or skill. The origin of playing cards is unknown, and almost as many theories exist as there are historians of the subjec...

Kennedy, John Fitzgerald

(Encyclopedia)Kennedy, John Fitzgerald, 1917–63, 35th President of the United States (1961–63), b. Brookline, Mass.; son of Joseph P. Kennedy. On Nov. 22, 1963, President Kennedy was shot and killed while ...