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siderite

(Encyclopedia)siderite kălˈĭbīt [key], a mineral, varying in color from brown, green, or gray to black and occurring in nature in massive and crystalline form. A carbonate of iron, FeCO3, it serves as an iron o...

Saône

(Encyclopedia)Saône sōn [key], river, 268 mi (431 km) long, rising in the Vosges Mts. near Épinal, E France, and flowing SW past Gray, Chalon-sur-Saône, and Mâcon to join the Rhône River at Lyons. An importan...

Southdown sheep

(Encyclopedia)Southdown sheep, mutton breed of sheep originated on the South Downs of Sussex, England, and now raised throughout the world. It is a small sheep, the most thickset of all breeds, and it is valued for...

ammonium sulfate

(Encyclopedia)ammonium sulfate, chemical compound, (NH4)2SO4, a colorless-to-gray, rhombohedral crystalline substance that occurs in nature as the mineral mascagnite. It is soluble in water and insoluble in alcohol...

fulminate

(Encyclopedia)fulminate fŭlˈmĭnāt [key], any salt of fulminic acid, HONC, a highly unstable compound known only in solution. The term is most commonly applied to the explosive mercury (II) fulminate, also calle...

Foulis, Andrew

(Encyclopedia)Foulis, Andrew foulz [key], 1712–75, and Robert Foulis, 1707–76, Scottish printers, brothers. They worked in partnership as printers to the Univ. of Glasgow. Their publications were famous both fo...

Albright, Ivan Le Lorraine

(Encyclopedia)Albright, Ivan Le Lorraine ôlˈbrīt [key], 1897–1983, American painter, b. North Harvey, Ill. Allied with the Magic Realist group, Albright developed a style combining American scene painting with...

Ferris, Woodbridge Nathan

(Encyclopedia)Ferris, Woodbridge Nathan, 1853–1928, American educator and public official, b. Tioga co., N.Y. After study (1873–74) at the Univ. of Michigan, he taught in country schools, and became a successfu...

patina

(Encyclopedia)patina pătˈənə [key], coating of carbonate of copper on articles of copper or bronze, formed after long exposure to a moist atmosphere or burial in the earth. Although commonly green, patina varie...

Valle, Pietro della

(Encyclopedia)Valle, Pietro della pyĕˈtrō dĕlˈlä välˈlā [key], 1586–1652, Italian traveler in Asia. He sailed (1614) from Venice; spent a year in Constantinople, where he studied Turkish and Arabic; then...