concrete block gravity wall
51British anti-invasion preparations of World War II — entailed a large scale division of military and civilian mobilization in response to the threat of invasion by German armed forces in 1940 and 1941. The army needed to recover from the defeat of the British Expeditionary Force in France, and 1.5… …
52nuclear reactor — Physics. reactor (def. 4). Also called nuclear pile. [1940 45] * * * Device that can initiate and control a self sustaining series of nuclear fission reactions. Neutrons released in one fission reaction may strike other heavy nuclei, causing them …
53Lock (water transport) — Canal lock and lock keeper s cottage on the Aylesbury Arm of the Grand Union Canal at Marsworth in Hertfordshire, England …
54Construction of the World Trade Center — For the post 9/11 rebuilding and ongoing construction at the World Trade Center site, see World Trade Center site. The completed World Trade Center in March 2001 The construction of the World Trade Center was conceived as an urban renewal project …
55Pykrete — is a composite material made of approximately 45 percent sawdust or some other form of wood pulp (such as paper) and 55 percent ice by weight. The properties of such a composite were apparently first noted by a couple of researchers at… …
56Ronan Point — was a 23 storey tower block in Newham, East London, which suffered a fatal partial collapse due to a natural gas explosion 16 May 1968.Ronan Point, named after Harry Ronan (a former Chairman of the Housing Committee of the London Borough of… …
57List of problems solved by MacGyver — This is a list of problems that have been solved by the fictional character MacGyver from the television series of the same name. (This list is not yet comprehensive.) MacGyver employs his resourcefulness and his knowledge of chemistry,… …
58France — /frans, frahns/; Fr. /frddahonns/, n. 1. Anatole /ann nann tawl /, (Jacques Anatole Thibault), 1844 1924, French novelist and essayist: Nobel prize 1921. 2. a republic in W Europe. 58,470,421; 212,736 sq. mi. (550,985 sq. km). Cap.: Paris. 3.… …
59Diffusion of technology in Canada — This article outlines the history of the diffusion or spread of technology in Canada. Technologies chosen for treatment here include, in rough order, transportation, communication, energy, materials, industry, public works, public services… …
60Glossary of rail terminology — Rail transport Operations Track Maintenance High speed Gauge Stations …
