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phlogiston theory

(Encyclopedia)phlogiston theory flōjĭsˈtŏn [key], hypothesis regarding combustion. The theory, advanced by J. J. Becher late in the 17th cent. and extended and popularized by G. E. Stahl, postulates that in all...

photoengraving

(Encyclopedia)photoengraving, photomechanical process in the graphic arts, used principally for reproducing illustrations. The subject is photographed, and the image is recorded on a sensitized metal plate, which i...

Campagnola, Domenico

(Encyclopedia)Campagnola, Domenico dōmĕˈnēkō kämpänyôˈlä [key], 1500–c.1564, painter and engraver. Although Campagnola worked exclusively in Italy, there are documents indicating that he was of German o...

Carriera, Rosalba

(Encyclopedia)Carriera, Rosalba rōzälˈbä kär-rēāˈrä [key], 1675–1757, Italian portrait and miniature painter, one of the greatest of her day. At 24 she had achieved a reputation throughout Italy and abro...

bauxite

(Encyclopedia)bauxite bôkˈsīt, bŏkˈ– [key], mixture of hydrated aluminum oxides usually containing oxides of iron and silicon in varying quantities. A noncrystalline substance formerly thought to be a minera...

Sussex spaniel

(Encyclopedia)Sussex spaniel, breed of short, stocky sporting dog developed in England in the late 18th and early 19th cent. It stands about 15 in. (38 cm) high at the shoulder and weighs between 35 and 45 lb (15.9...

rum

(Encyclopedia)rum, spirituous liquor made from fermented sugarcane products. Prepared by fermentation, distillation, and aging, it is made from the molasses and foam that rise to the top of boiled sugarcane juice. ...

Spectral Classes for Main Sequence Stars (table)

(Encyclopedia)Characteristics of Spectral Classes for Main Sequence Stars ...

soapstone

(Encyclopedia)soapstone or steatite stēˈətīt [key], metamorphic rock of which the characteristic and usually chief mineral is talc, but which also contains varying parts of chlorite, mica, tremolite, quartz, ma...

Puvis de Chavannes, Pierre

(Encyclopedia)Puvis de Chavannes, Pierre pyĕr püvēˈ də shävänˈ [key], 1824–98, French mural painter, b. Lyons. In 1844 he went to Paris, where he studied under Delacroix and Couture. His painting War (Ami...