(Encyclopedia) TulaTulat&oomacr;ˈlə [key], city (1991 pop. 545,000), capital of Tula region, N central European Russia, on the Upa River, a tributary of the Oka. It is an important rail and…
(Encyclopedia) bobbin, implement on which thread is wound, used in sewing, spinning, weaving, and lace making. Sometimes the wooden spools of sewing thread are called bobbins. The bobbin of a sewing…
(Encyclopedia) Woods, Granville Taylor,, 1856–1910, African-American inventor, b. Columbus, Ohio. He worked in a railroad shop as a youth, becoming a machinist and blacksmith. He subsequently worked…
(Encyclopedia) bronze, in metallurgy, alloy of copper, tin, zinc, phosphorus, and sometimes small amounts of other elements. Bronzes are harder than brasses. Most are produced by melting the copper…
(Encyclopedia) ZhenjiangZhenjiangjŭnˈjyängˈ [key] or ChinkiangZhenjiangchĭnˈkyăngˈ, jĭnˈjyängˈ [key], city (1994 est. pop. 405,700), S Jiangsu prov., China, a port at the junction of the Grand Canal…
(Encyclopedia) Barnard, Christiaan NeethlingBarnard, Christiaan Neethlingkrĭsˈtēänˌ nāˈᵺĭng bärˈnərd [key], 1922–2001, South African surgeon. The son of a Dutch Reformed minister, Barnard studied…
(Encyclopedia) rosin or colophony, hard, brittle, translucent resin, obtained as a solid residue from crude turpentine. Usually pale yellow or amber, its color may vary from brownish-black to…
(Encyclopedia) bearing, machine part designed to reduce friction between moving parts or to support moving loads. There are two main kinds of bearings: the antifriction type, such as the roller…
(Encyclopedia) watch, small, portable timepiece usually designed to be worn on the person. Other kinds of timepieces are generally referred to as clocks. At one time it was generally believed that…
Source: The U.S. Treasury Department, Bureau of Engraving and Printing In 1996, the United States began issuing currency with a new design and additional security features. Pre-existing security…
