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Mount, William Sidney

(Encyclopedia)Mount, William Sidney, 1807–68, American genre and portrait painter, b. Setauket, N.Y. His childhood was spent at Stony Brook, Long Island, the scene of many of his pictures. At 17 he was apprentice...

CAT scan

(Encyclopedia)CAT scan kăt [key] [computerized axial tomography], X-ray technique that allows relatively safe, painless, and rapid diagnosis in previously inaccessible areas of the body; also called CT scan. An X-...

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...

mechanics

(Encyclopedia)mechanics, branch of physics concerned with motion and the forces that tend to cause it; it includes study of the mechanical properties of matter, such as density, elasticity, and viscosity. Mechanics...

auteur

(Encyclopedia)auteur ōtörˈ [key], in film criticism, a director who so dominates the film-making process that it is appropriate to call the director the auteur, or author, of the motion picture. The auteur theor...

Lorentz contraction

(Encyclopedia)Lorentz contraction lôrˈĕnts [key], in physics, contraction or foreshortening of a moving body in the direction of its motion, proposed by H. A. Lorentz on theoretical grounds and based on an earli...

Cassatt, Mary

(Encyclopedia)Cassatt, Mary kəsătˈ [key], 1844–1926, American figure painter and etcher, b. Pittsburgh. Most of her life was spent in France, where she was greatly influenced by her great French contemporaries...

Library of Congress

(Encyclopedia)Library of Congress, national library of the United States, Washington, D.C., est. 1800. It occcupies three buildings on Capitol Hill: The Thomas Jefferson Building (1897), the John Adams Building (19...

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...

work

(Encyclopedia)work, in physics and mechanics, transfer of energy by a force acting to displace a body. Work is equal to the product of the force and the distance through which it produces movement. Although both fo...