Titanium. Lustrous, steel-like white metal resembling iron, burning in air, and the only metal to burn in nitrogen: Symbol TI, at,wt. 47.90, at. no. 22. Discovered by Gregor (1791), it was named by Klaproth in 1795 and obtained pure by Hunter in 1910. Its compounds occur in practically all igneous rocks and their sedimentary deposits. The oxide is used in high-grade white pigments, and some barium compounds are used in high value capacitors, of great strength and corrosion- resistance, it is used in Concorde and spacecraft, and was found on the Moon in the Sea of Tranquillity.

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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