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ore

(Encyclopedia)ore, metal-bearing mineral mass that can be profitably mined. Nearly all rock deposits contain some metallic minerals, but in many cases the concentration of metal is too low to justify mining the ore...

Ayacucho

(Encyclopedia)Ayacucho äyäko͞oˈchō [key], city, capital of Ayacucho dept., S central Peru. It is a commercial center in a rich mining region that produces gold, silver, and nickel....

steel

(Encyclopedia)steel, alloy of iron, carbon, and small proportions of other elements. Iron contains impurities in the form of silicon, phosphorus, sulfur, and manganese; steelmaking involves the removal of these imp...

battery, electric

(Encyclopedia)CE5 Lead storage cell: At the lead-dioxide electrode, electrons from the circuit combine with lead dioxide and sulfuric acid to form lead sulfate and water. At the spongy-lead electrode, lead react...

dime novels

(Encyclopedia)dime novels, swift-moving, thrilling novels, mainly about the American Revolution, the frontier period, and the Civil War. The books were first sold in 1860 for 10 cents by the firm of Beadle and Adam...

Chrysler Building

(Encyclopedia)Chrysler Building, in midtown Manhattan, New York City, at Lexington Ave. between 42d and 43d St. The ultimate art deco-style skyscraper, it was commissioned by Walter P. Chrysler, designed by William...

brass

(Encyclopedia)brass, alloy having copper (55%–90%) and zinc (10%–45%) as its essential components. The properties of brass vary with the proportion of copper and zinc and with the addition of small amounts of o...

bead test

(Encyclopedia)bead test, test used in the identification of certain metals. Some metallic ions that cannot be identified by a flame test are identified by a bead test. The test can also be used to confirm the resul...

Sheffield plate

(Encyclopedia)Sheffield plate, metalware of copper, silver-plated by fusion, originated at Sheffield, England. This process of plating was discovered c.1742 by a Sheffield cutler, Thomas Boulsover, who found while ...

Gardner, John

(Encyclopedia)Gardner, John (John Champlin Gardner, Jr.), 1933–82, American writer, b. Batavia, N.Y. He was a teacher, lecturer, and prolific writer of fiction, children's books, poetry, radio plays, and scholarl...