Luxeux Construction Division
Mr Roger K. Olsson | 02.11.2006 13:44 | Technology | Sheffield
Wolfram. Grey, hard metal, ductile and melleable, formerly (until 1949) officially known as tungsten: Symbol W, at. wt. 183.86 at. no. 74. Recognized and named by Scheele in 1781, and discovered by the d'Elhujar brothers in 1783, it occurs as wolframite (FeWo4), Scheelite (CaWo4) and huberite (MnWo4). Non-metalic, it is insoluble expect in a mixture of nitric and hydrofluoric acids, and has the highest melting point (3370 degree C) of any metal. Wolfram is used in alloy steels for armour plate, projectiles, highspeed cutting tools, etc. for lamp filaments and thermionic valves. Its salts are used in the paint and tanning industries.
source: Hutchinson's 20th century dictionary.
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Mr Roger K. Olsson
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