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Ridge, Tom

(Encyclopedia)Ridge, Tom (Thomas Joseph Ridge), 1945–, U.S. politician and government official, first secretary of Homeland Security (2003–5), b. Munhall, Pa. A graduate of Harvard (1967) and the Dickinson Scho...

Clark, Tom Campbell

(Encyclopedia)Clark, Tom Campbell, 1899–1977, U.S. attorney general (1945–49), associate justice of the U.S. Supreme Court (1949–67), b. Dallas, Tex.; father of Ramsey Clark. He received his law degree from t...

Johnson, Tom Loftin

(Encyclopedia)Johnson, Tom Loftin, 1854–1911, American municipal reformer, mayor of Cleveland (1901–10), b. Georgetown, Ky. He acquired a substantial fortune from streetcar and steel interests, and, deeply infl...

carbon black

(Encyclopedia)carbon black, mixture of partially burned hydrocarbons. Carbon black is produced by partial combustion of natural gas. It is used as a black pigment for inks and paints, and is used in large amounts b...

bone black

(Encyclopedia)bone black, solid black material, largely carbon, produced by heating animal bones to high temperatures in the absence of air so as to drive off volatile substances. Finely divided bone black is usefu...

Black, Hugh

(Encyclopedia)Black, Hugh, 1868–1953, Scottish-American theologian and author. After serving as a pastor in Paisley and Edinburgh, he emigrated to the United States in 1906 to begin a professorship of practical t...

Black, James

(Encyclopedia)Black, James, 1823–93, American temperance leader. A Pennsylvania lawyer, he was active in state and national temperance work. His plan for a National Publication House was adopted by the National T...

Black, Joseph

(Encyclopedia)Black, Joseph, 1728–99, Scottish chemist and physician, b. France. He was professor of chemistry at Glasgow (1756–66) and from 1766 at Edinburgh. He is best known for his theories of latent heat a...

Black, Max

(Encyclopedia)Black, Max, 1909–88, American analytical philosopher, b. Baku, Russia (now Bakı, Azerbaijan), grad. Cambridge, Ph.D. Univ. of London, 1939. He taught at the Univ. of Illinois (1940–46) before goi...

Black Belt

(Encyclopedia)Black Belt, term applied to several areas of Mississippi and Alabama, the heart of the Old South, which are characterized by black soil and excellent cotton-growing conditions. The Black Belt area was...