centre cross-piece
81optics — /op tiks/, n. (used with a sing. v.) the branch of physical science that deals with the properties and phenomena of both visible and invisible light and with vision. [1605 15; < ML optica < Gk optiká, n. use of neut. pl. of OPTIKÓS; see OPTIC,… …
82Russia — /rush euh/, n. 1. Also called Russian Empire. Russian, Rossiya. a former empire in E Europe and N and W Asia: overthrown by the Russian Revolution 1917. Cap.: St. Petersburg (1703 1917). 2. See Union of Soviet Socialist Republics. 3. See Russian… …
83Cambridge — This article is about the city in England. For other uses, see Cambridge (disambiguation). City of Cambridge   Non metropolitan district, city   …
84Asturian architecture — Pre Romanesque architecture in Asturias is framed between the years 711 and 910, the period of the rise, extension and disappearance of the kingdom of Asturias. [citebook|title=The Archaeology of Iberia: The Dynamics of Change |author= S. J. Keay …
85Germany — /jerr meuh nee/, n. a republic in central Europe: after World War II divided into four zones, British, French, U.S., and Soviet, and in 1949 into East Germany and West Germany; East and West Germany were reunited in 1990. 84,068,216; 137,852 sq.… …
86Timeline of the Irish Civil War — This is a timeline of the Irish Civil War, which took place between June 1922 and May 1923. It followed the Irish War of Independence (1919–1921), and accompanied the establishment of the Irish Free State as an entity independent from the United… …
87Bicycle brake — Animation of a single pivot side pull calliper brake for the rear wheel of a steel framed road bike. A bicycle brake is used to slow down or stop a bicycle. There have been various types of brake used throughout history, and several are still in… …
88Rubik's Cube — Other names Magic Cube …
89Winston Churchill — For other uses, see Winston Churchill (disambiguation). Churchill redirects here. For other uses, see Churchill (disambiguation). The Right Honourable Sir Winston Churchill …
90List of chess terms — This page explains commonly used terms in chess in alphabetical order. Some of these have their own pages, like fork and pin. For a list of unorthodox chess pieces, see fairy chess piece; for a list of terms specific to chess problems, see chess… …
