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chemical warfare

(Encyclopedia)chemical warfare, employment in war of incendiaries, poison gases, and other chemical substances. Ancient armies attacking or defending fortified cities threw burning oil and fireballs. A primitive ty...

trench warfare

(Encyclopedia)trench warfare. Although trenches were used in ancient and medieval warfare, in the American Civil War, and in the Russo-Japanese War (1904–5), they did not become important until World War I. The i...

biological warfare

(Encyclopedia)biological warfare, employment in war of microorganisms to injure or destroy people, animals, or crops; also called germ or bacteriological warfare. Limited attempts have been made in the past to spre...

United Mine Workers of America

(Encyclopedia)United Mine Workers of America (UMW), international labor union formed (1890) by the amalgamation of the National Progressive Union (organized 1888) and the mine locals under the Knights of Labor. It ...

drainage, in mining

(Encyclopedia)drainage, in mining, removal of water seeping into shafts and other underground mine workings from the surrounding ground. Unless seeping water is removed continually, it may endanger haulage and mini...

Tabor, Horace Austin Warner

(Encyclopedia)Tabor, Horace Austin Warner tāˈbər [key], 1830–99, American prospector, known as Silver Dollar Tabor, b. Holland, Vt. From the Matchless Mine at Leadville, Colo., he gained tremendous wealth by m...

In

(Encyclopedia)In, symbol for the element indium. ...

Lead, city, United States

(Encyclopedia)Lead lēd [key], city (1990 pop. 3,632), Lawrence co., W S.Dak., in the Black Hills; laid out 1876 after the discovery of gold there, inc. 1890. It is the site of the famous Homestake Mine, which was ...

safety lamp

(Encyclopedia)safety lamp, oil lamp designed for safe use in mines and other places where flammable gases such as firedamp (see damp) may be present. Its invention (c.1816) is usually attributed to Sir Humphry Davy...

International Campaign to Ban Landmines

(Encyclopedia)International Campaign to Ban Landmines (ICBL), global network of nongovernmental organizations (NGOs) working toward the eradication of antipersonnel land mines. Established in 1992 by the Vietnam Ve...