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motion picture camera
(Encyclopedia)motion picture camera: see under camera. ...motion picture photography
(Encyclopedia)motion picture photography or cinematography, photographic arts and techniques involved in making motion pictures. See also photography, still. Cinematography developed as a separate craft ve...simple harmonic motion
(Encyclopedia)simple harmonic motion: see harmonic motion. ...perpetual-motion machine
(Encyclopedia)perpetual-motion machine, device that would be able to operate continuously and supply useful work, in violation of the laws of thermodynamics. A machine that would produce more energy in the form of ...celestial mechanics
(Encyclopedia)celestial mechanics, the study of the motions of astronomical bodies as they move under the influence of their mutual gravitation. Celestial mechanics analyzes the orbital motions of planets, dwarf pl...Motion, Sir Andrew Peter
(Encyclopedia)Motion, Sir Andrew Peter, 1952–, English poet and biographer, poet laureate of England (1999–2009), grad. University College, Oxford (B.A., 1974; M.Litt., 1977). He writes poems that are both lyri...Sitter, Willem de
(Encyclopedia)Sitter, Willem de vĭlˈəm də sĭtˈər [key], 1872–1934, Dutch astronomer and mathematician. He was professor from 1908 at the Univ. of Leiden and in 1919 became director of its observatory. His ...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...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...Eddington, Sir Arthur Stanley
(Encyclopedia)Eddington, Sir Arthur Stanley, 1882–1944, British astronomer and physicist. He was chief assistant (1906–13) at the Royal Observatory, Greenwich, and was from 1913 Plumian professor of astronomy a...Browse by Subject
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