Columbia Encyclopedia

Search results

500 results found

servomechanism

(Encyclopedia)servomechanism, automatic device for the control of a large power output by means of a small power input or for maintaining correct operating conditions in a mechanism. It is a type of feedback contro...

Constitution, ship

(Encyclopedia)Constitution, U.S. 44-gun frigate, nicknamed Old Ironsides. It is perhaps the most famous vessel in the history of the U.S. navy. Authorized by Congress in 1794, the ship was launched in 1797 and was ...

feedback

(Encyclopedia)CE5 Basic feedback control system feedback, arrangement for the automatic self-regulation of an electrical, mechanical, or biological system by returning part of its output as input. A simple exam...

Sanger, Margaret Higgins

(Encyclopedia)Sanger, Margaret Higgins, 1879–1966, American leader in the birth control movement, b. Corning, N.Y. Personal experience and work as a public-health nurse, much of it on New York City's Lower East S...

Ecclestone, Bernie

(Encyclopedia)Ecclestone, Bernie (Bernard Charles Ecclestone), 1930–, English automobile racing executive. After a short career racing Formula Three cars in the late 1940s and early 1950s, he managed Formula One ...

Abu Musa

(Encyclopedia)Abu Musa, island (2010 est. pop. 1,868), c. 4.6 sq mi (12 sq km), E Persian Gulf, disputed between Iran, who occupies it, and the United Arab Emirates. Strategically located near the entra...

Paterson

(Encyclopedia)Paterson, city (1990 pop. 140,891), seat of Passaic co., NE N.J., at the falls of the Passaic River; inc. 1851. Founded in 1791 by Alexander Hamilton and others of the Society for Establishing Useful ...

Penn, Arthur Hiller

(Encyclopedia)Penn, Arthur Hiller, 1922–2010, American director, brother of Irving Penn, b. Philadelphia; studied Black Mountain College and the Actors' Studio, Los Angeles. Penn, who often dealt with themes of a...

Brownsville

(Encyclopedia)Brownsville, city (2020 pop. 186,738), seat of Cameron co., extreme S Tex., on the Rio Grande c.17 mi (30 km) from its mouth at the Gulf of Mexico; inc....

airfoil

(Encyclopedia)airfoil, surface designed to develop a desired force by reaction with a fluid, especially air, that is flowing across the surface. For example, the fixed wing surfaces of an airplane produce lift, whi...