Columbia Encyclopedia

Search results

500 results found

speed

(Encyclopedia)speed, change in distance with respect to time. Speed is a scalar rather than a vector quantity; i.e., the speed of a body tells one how fast the body is moving but not the direction of the motion. If...

stroboscope

(Encyclopedia)stroboscope strŏbˈəskōp [key], optical instrument for making a moving object appear to be slowed down or stationary. This effect is created by interrupting the observer's view so that the object i...

Chatsworth

(Encyclopedia)Chatsworth, estate, Derbyshire, central England, near Chesterfield. It is the seat of the dukes of Devonshire. Begun in 1552, the present Classical-style Chatsworth House was rebuilt in 1686. It has n...

sodium thiosulfate

(Encyclopedia)sodium thiosulfate, Na2S2O3, colorless crystalline compound that is more familiar as the pentahydrate, Na2S2O3·5H2O, an efflorescent, monoclinic crystalline substance also called sodium hyposulfite o...

sound

(Encyclopedia)CE5 Sound waves: An air pressure wave radiating outward from a loudspeaker is perceived as sound. sound, any disturbance that travels through an elastic medium such as air, ground, or water to be ...

aberration of starlight

(Encyclopedia)aberration of starlight, displacement of the apparent path of light from a star, resulting in a displacement of the apparent position of the star from its true position; discovered by the English astr...

art

(Encyclopedia)art. The major general surveys on topics in the fine arts are painting; sculpture; drawing; photography, and architecture. See also articles on specific artists, periods, styles, regions, genres, and...

Weston, Edward

(Encyclopedia)Weston, Edward, 1886–1958, American photographer, b. Highland Park, Ill. Weston began to make photographs in Chicago parks in 1902, and his works were first exhibited in 1903 at the Art Institute of...

Allen, Woody

(Encyclopedia)Allen, Woody, 1935–, American actor, writer, and director, one of contemporary America's leading filmmakers, b. Brooklyn, N.Y., as Allen Stewart Konigsberg. Allen began his career writing for televi...

nutation

(Encyclopedia)nutation, in astronomy, a slight wobbling motion of the earth's axis. The causes of nutation are similar to those of the precession of the equinoxes, involving the varying attraction of the moon on th...