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Ch. 23: Noble Metals

Ch. 23: Noble Metals Page of 501 Ch. 24: Gold Text size:minus plus Restore normal size   Mail page  Print this page
360                     METALS—THE NOBLER.
A list of Seven Noble Metals is that which obtained in the most ancient times : Gold, Electrum (clearly an alloy of gold and silver), Silver, Copper, Tin, Lead, Iron.
The subject of Metallurgy is just now attracting to itself special scientific attention. At Sheffield, to wit, there is a school established for the particular study of this science. Its chief, Professor J. 0. Arnold, has recently delivered a lecture at the same on the "Internal Architecture of Metals," January 25th, 1907. Speaking there about a metal rod, as used in the construction of a motor-car, he explained that the metal forming this bar consists of crystals ; " upon the nature of which towards one another depend nearly all those metallic properties that are of such great practical importance for working purposes." And it is an undoubted fact that these aggregated crystals are liable to fatigue from too prolonged, or too arduous a strain ; which so-called " fatigue " of metals is a generic term now used to explain all cases of fracture, such as may be thus under­stood. It bears likewise on " repose in the living animal, as in the not living metal, or mineral." For, " there is more than a superficial resemblance between so-called ' fatigue ' in a metal, and the fatigue of an overwrought literary man;"—"only the metallurgical explanation would be expressed in vastly different terms from the physiological explanation."
Ch. 23: Noble Metals Page of 501 Ch. 24: Gold
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