case-hardened outer shell

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• Case hardening — or surface hardening is the process of hardening the surface of a metal, often a low carbon steel, by infusing elements into the material s surface, forming a thin layer of a harder alloy. Case hardening is usually done after the part in question …   Wikipedia

• Shell (projectile) — This article is about the artillery projectile. For the small arms ammunition, see Shotgun shell. Some sectioned shells from the First World War. From left to right: 90 mm fragmentation shell, 120 mm pig iron incendiary shell, 77/14 model 75 mm… …   Wikipedia

• British hardened field defences of World War II — Hexagonal pillbox (type 22) British hardened field defences of World War II were small fortified structures constructed as a part of British anti invasion preparations. They were popularly known as pillboxes by reference to their shape.[1] Con …   Wikipedia

• The Shell Grotto — There is also a Shell Grotto in Margate.The Shell Grotto (sometimes called the Shell Hermitage) is a late 18th century stone built, slate roofed grotto decorated with shells and animal bones on the interior. It stands on a prominent ridge 700 ft… …   Wikipedia

• building construction — Techniques and industry involved in the assembly and erection of structures. Early humans built primarily for shelter, using simple methods. Building materials came from the land, and fabrication was dictated by the limits of the materials and… …   Universalium

• List of Pokémon (202–251) — Contents 1 Wobbuffet 2 Girafarig 3 Pineco 4 Forretress …   Wikipedia

• List of Pokémon (201-220) — At the core of the multi billion dollarcite web|url=http://sev.prnewswire.com/entertainment/20051004/LATU06404102005 1.html|title=Pokémon Franchise Approaches 150 Million Games Sold|publisher=PR Newswire|accessdate=] Pokémon media franchise of… …   Wikipedia

• Lost-wax casting — A model of an apple in wax …   Wikipedia

• Diffusion hardening — Schematic cutaway view of a diffusion hardened metal gear Diffusion hardening is a process used in manufacturing that increases the hardness of steels. In diffusion hardening, diffusion occurs between a steel with a low carbon content and a… …   Wikipedia

• architecture — /ahr ki tek cheuhr/, n. 1. the profession of designing buildings, open areas, communities, and other artificial constructions and environments, usually with some regard to aesthetic effect. Architecture often includes design or selection of… …   Universalium

• Bakhdida — (Syriac: ܒܓܕܝܕܐ, Arabic:بخديدا or قره قوش), also known as Al Hamdaniya Municipality, is an Assyrian town in the northern Iraq Ninawa Governorate, located about 32 km southeast of the city of Mosul amid agricultural lands, close to the ruins of… …   Wikipedia