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Encyclopedia Britannica - Main :: GEO-GNU |
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GERMAN SILVER or NICKEL SILVER, an alloy of copper, nickel and zinc, prepared either by melting the copper and nickel together in a crucible, and adding piece by piece the previously, heated zinc, or by heating
' of charcoal. To destroy its crystalline structure and so render it fit for working, it is heated to dull redness, and then allowed to cool. German silver is harder than silver; it resembles that metal in colour, but is of a greyer tinge. Exposed to the air it tarnishes slightly yellow, and with vinegar affords a crust of verdigris
bright red heat it melts, losing its zinc by oxida-tion unless protected from the atmosphere. At a heat above dull redness it becomes exceedingly brittle. German silver in various modifications of composition is much used in the arts. Alloys , of which about 5o% is copper and the residue zinc and nickel in about equal proportions take a fine polish
rolling
white
iron . German silver for casting contains 2 or 3 % of lead, which like iron increases the whiteness of the alloy. German silver, having a high specific resistance and a low temperature coefficient, has been used for electrical resistance coils, and these qualities are possessed in a still greater degree in manganin, which contains manganese in place of zinc, its composition being 84% of copper, 12 of manganese and 4 of nickel. The addition of a trace of tungsten to German silver, as in platinoid, also largely increases the resistance.End of Article: GERMAN SILVER If you wish, you can link directly to this article.
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