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centrifuge

(Encyclopedia)centrifuge sĕnˈtrəfyo͞oj [key], device using centrifugal force to separate two or more substances of different density, e.g., two liquids or a liquid and a solid. The centrifuge consists of a fixe...

caricature

(Encyclopedia)caricature, a satirical drawing, plastic representation, or description which, through exaggeration of natural features, makes its subject appear ridiculous. Although 16th-century Northern painters, s...

quelea

(Encyclopedia)quelea kwēˈlēə [key], common name for an East African weaverbird, Quelea quelea. Less than 5 in. (13 cm) long and weighing slightly more than 1⁄2 oz (1.4 grams), these tiny birds are found throu...

Vienna Philharmonic

(Encyclopedia)Vienna Philharmonic, symphony orchestra in Vienna, Austria, founded 1842 and based at the Weiner Musikverein. The orchestra is a self-governing institution whose members are selected exclusively from ...

transistor

(Encyclopedia)CE5 Simple transistor circuit transistor, three-terminal, solid-state electronic device used for amplification and switching. It is the solid-state analog to the triode electron tube; the transist...

cocaine

(Encyclopedia)cocaine kōkānˈ, kōˈkān [key], alkaloid drug derived from the leaves of the coca shrub. A commonly abused illegal drug, cocaine has limited medical uses, most often in surgical applications that ...

pressure

(Encyclopedia)pressure, in mechanics, ratio of the force acting on a surface to the area of the surface; it is thus distinct from the total force acting on a surface. A force can be applied to and sustained by a si...

Draper, John William

(Encyclopedia)Draper, John William, 1811–82, American scientist, philosopher, and historian, b. near Liverpool, England, M.D. Univ. of Pennsylvania, 1836. In 1839 he became professor of chemistry at the Univ. of ...

Dalí, Salvador

(Encyclopedia)Dalí, Salvador sälväthōrˈ dälēˈ, däˈlē [key], 1904–89, Spanish painter. At first influenced by futurism, in 1924 Dalí came under the influence of the Italian painter de Chirico and by 19...

aberration

(Encyclopedia)CE5 A. Spherical aberration: Light rays near the edge of the lens are bent more and brought to focus nearer to the lens. B. Chromatic aberration: Shorter wavelengths (higher frequencies) are bent m...