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magnetron

(Encyclopedia)magnetron măgˈnĭtrŏnˌ [key], vacuum tube oscillator (see electron tube) that generates high-power electromagnetic signals in the microwave frequency range. Its operation is based on the combined ...

Louisiana Purchase

(Encyclopedia)CE5 Louisiana Purchase (1803) Louisiana Purchase, 1803, American acquisition from France of the formerly Spanish region of Louisiana. Jefferson instructed Livingston to attempt to purchase the �...

aluminum

(Encyclopedia)aluminum ălˌyo͞omĭnˈēəm [key], metallic chemical element; symbol Al; at. no. 13; at. wt. 26.98154; m.p. 660.37℃; b.p. 2,467℃; sp. gr. 2.6989 at 20℃; valence +3. Aluminum is a silver-white...

Disraeli, Benjamin, 1st earl of Beaconsfield

(Encyclopedia)Disraeli, Benjamin, 1st earl of Beaconsfield dĭzrāˈlē [key], 1804–81, British statesman and author. He is regarded as the founder of the modern Conservative party. Disraeli succeeded the earl ...

Constance, Council of

(Encyclopedia)Constance, Council of, 1414–18, council of the Roman Catholic Church, some of its sessions being reckoned as the 16th ecumenical council. It was summoned to end the Great Schism (see Schism, Great),...

Columbus

(Encyclopedia)Columbus. 1 City (2020 pop. 206,922), seat of Muscogee co., W Ga., at the head of navigation on the Chattahoochee River; settled and inc. 1828 on the ...

Arlington National Cemetery

(Encyclopedia)Arlington National Cemetery, 420 acres (170 hectares), N Va., across the Potomac River from Washington, D.C.; est. 1864. More than 60,000 American war dead, as well as notables including Presidents Wi...

Keaton, Buster

(Encyclopedia)Keaton, Buster (Joseph Francis Keaton), 1895–1966, American movie actor, b. Piqua, Kans. Considered one of the greatest comic actors in film history, Keaton used his considerable acrobatic skills, w...

Meyer, Adolf

(Encyclopedia)Meyer, Adolf äˈdôlf mīˈər [key], 1866–1950, American neurologist and psychiatrist, b. Switzerland, M.D. Zürich, 1892. He emigrated to the United States in 1892 and was professor of psychiatry...

Gladstone, Herbert John Gladstone, 1st Viscount

(Encyclopedia)Gladstone, Herbert John Gladstone, 1st Viscount glădˈstən [key], 1854–1930, British statesman; son of William E. Gladstone. A member of Parliament from 1880 to 1910, he held various offices under...