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echo sounder

(Encyclopedia)echo sounder, an older instrumentation system for indirectly determining ocean floor depth. Echo sounding is based on the principle that water is an excellent medium for the transmission of sound wave...

sonic boom

(Encyclopedia)CE5 Sonic boom wave pattern from a supersonic aircraft and variation in pressure sonic boom, shock wave produced by an object moving through the air at supersonic speed, i.e., faster than the spee...

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...

Pulitzer Prizes

(Encyclopedia)Pulitzer Prizes, annual awards for achievements in American journalism, letters, and music. The prizes are paid from the income of a fund left by Joseph Pulitzer to the trustees of Columbia Univ. They...

Kennedy, Joseph Patrick

(Encyclopedia)Kennedy, Joseph Patrick, 1888–1969, U.S. ambassador to Great Britain (1937–40), b. Boston, grad. Harvard, 1912. The founder of an American dynasty, he was the father of nine children, including Jo...

physics

(Encyclopedia)physics, branch of science traditionally defined as the study of matter, energy, and the relation between them; it was called natural philosophy until the late 19th cent. and is still known by this na...

Leiter, Saul

(Encyclopedia)Leiter, Saul lītˈər [key], 1923–2013, American photographer, b. Pittsburgh. A painter in the early 1940s, Leiter switched to photography late in the decade. Along with Robert Frank and Diane Arbu...

camouflage

(Encyclopedia)camouflage kămˈəfläzh [key], in warfare, the disguising of objects with artificial aids, especially for the purpose of making them blend into their surroundings or of deceiving the observer as to ...

Swan, Sir Joseph Wilson

(Encyclopedia)Swan, Sir Joseph Wilson, 1828–1914, English chemist and physicist. He made an incandescent lamp using a carbon filament (1860), 20 years before Edison's lamp. Noted for important contributions to ph...

Fisk University

(Encyclopedia)Fisk University, at Nashville, Tenn.; coeducational; founded 1865, opened 1866, and chartered 1867. It became a university in 1967. Fisk, long an outstanding African-American school, is open to all qu...