lead sheathing

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• Lead — (pronEng|ˈlɛd) is a main group element with a symbol Pb ( la. plumbum). Lead has the atomic number 82. Lead is a soft, malleable poor metal, also considered to be one of the heavy metals. Lead has a bluish white color when freshly cut, but… …   Wikipedia

• lead processing — Introduction       preparation of the ore for use in various products.       Lead (Pb) is one of the oldest metals known, being one of seven metals used in the ancient world (the others are gold, silver, copper, iron, tin, and mercury). Its low… …   Universalium

• Copper sheathing — was the practice of protecting the under water hull of a ship or boat through the use of copper plates affixed to the outside of the hull. It was pioneered and developed by the Royal Navy during the 18th century. Contents 1 Development 2 Humphry… …   Wikipedia

• Walter Lincoln Hawkins — (March 21, 1911–August 20, 1992) was a black scientist/inventor who, while working at Bell Laboratories in the 1940s, helped to make universal telephone service possible. Hawkins developed a plastic to insulate telephone wires mdash; a new… …   Wikipedia

• Nemi ships — The remains of the hull of one of the two ships recovered from Lake Nemi. Workers in the foreground give an indication of scale …   Wikipedia

• Galvanic corrosion — This new manifold for water meters has replaced the old one after 4 years of use, having been connected directly to a copper pipe in the building (0.85 V of potential difference, see the point of corrosion in the bottom left). With a PVC battery… …   Wikipedia

• Kyrenia ship — The Kyrenia ship is the wreck of a 4th century BC Greek merchant ship. It was discovered by Greek Cypriot sponge diver Andreas Kariolou in 1967 and salvaged close to Kyrenia in Cyprus in an expedition directed by Michael Katzev, a graduate… …   Wikipedia

• Dromon —    The standard Byzantine warship that employed both sails and oars. A typical 10th century dromon had two banks of oars employing 200 rowers, in addition to a battering ram on the prow, and enough heavily armored marines to board an enemy ship… …   Historical dictionary of Byzantium

• 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

• metalwork — metalworker, n. /met l werrk /, n. objects made of metal. [1840 50; METAL + WORK] * * * Useful and decorative objects fashioned of various metals. The oldest technique is hammering. After с 2500 BC, casting was also used, molten metal being… …   Universalium

• Diffusion 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… …   Wikipedia