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flame
flame phenomenon associated with the chemical reaction of a gas that has been heated above its kindling temperature with some other gas, usually atmospheric oxygen (see combustion ). The heat and light given off are characteristic of the specific chemical reaction (or reactions) going on; the... Read more |
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welding
welding process for joining separate pieces of metal in a continuous metallic bond. Cold-pressure welding is accomplished by the application of high pressure at room temperature; forge welding (forging) is done by means of hammering, with the addition of heat. In most processes in common use, the... Read more |
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Atomic emission spectroscopy
Flame Analysis Some forensic analytical determinations rely on the separation of the various components in a mixture of compounds. One means of accomplishing this separation is to heat the sample using a flame. The separated compounds can then be analyzed and identified. For example, when metals are... Read more |
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taconite
taconite low-grade iron ore, a flintlike rock usually containing less than 30% iron. Resistant to drilling and to the extraction of its contained metal, the rock was long considered worthless. Experiments begun in 1912 by the American scientist Edward W. Davis and continued by him for nearly 40... Read more |
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daft
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ignition
ignition apparatus for igniting a combustible mixture. The German engineer Nikolaus A. Otto, in his first gas engine, used flame ignition; another method was heating a metal tube to incandescence. Ignition systems in modern automobiles use an electric spark to ignite the compressed mixture of air... Read more |
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Umberto Eco
Umberto Eco , 1932-, Italian novelist, essayist, and scholar. His first novel, The Name of the Rose (tr. 1983), is a medieval mystery. A pastiche of detective fiction, medieval philosophy, and moral reflection, it encapsulates his semiotic theory, which describes how signs are produced and... Read more |
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Nikolai Nikolaevich Semenov
SEMENOV, NIKOLAĆ® NIKOLAEVICH(b. Saratov, Russia, 15 April 1896, d. Moscow, Russia, 25 September 1986), molecular physics, physical chemistry, chemical physics.Semenov is credited with the discovery of a new type of chemical process: the so-called branched chain reaction. He determined the mechanisms... Read more |
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fire of London
London, fire of, 1666. The dangers of fire in any early town with close-packed wooden buildings were always considerable, but the blaze that started in Thomas Farriner's bakehouse in Pudding Lane, near London Bridge, in the early hours of Sunday, 2 September, has become known as the ‘Great... Read more |
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Trial by Ordeal
trial by ordeal was used to decide the guilt or innocence of a suspected criminal by invoking divine justice. There were several forms of ordeal in Anglo-Saxon and Norman England. In one the accused held a red hot iron or put his hand in a flame. The hand was then bound up and examined after several... Read more |
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