Mixed Metals; Or, Metallic Alloys

Mixed Metals; Or, Metallic Alloys

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1890 edition. Excerpt: ...a good white colour being a great desideratum. Thus: Nevada Silver, Virginia Silver, Polosi Silver, Silveroid, Silverite, Electrum, Afenide, Agiroide, etc., are simply German silver; but in some cases a little cobalt is present as well as nickel, and some makers add a small quantity of iron or manganese. 1 to 3 per cent of lead is sometimes added for cast work. The properties which make German silver so valuable are: --its white colour, lustre, hardness, tenacity, toughness, malleability, ductility, and power of resisting certain chemical influences. When carefully prepared it works well under the stamp, and between the rolls, but it is advisable that the metals used in alloying should be as pure as possible, since small quantities of certain impurities, such as arsenic, seriously injure its working qualities. Cobalt frequently accompanies nickel in its ores, and becomes reduced at the same time as that metal, and alloys readily with it; but as the chemical and physical properties of both metals are closely allied to each other, cobalt does not exert an injurious influence. Iron has a beneficial effect on German silver for some purposes. It makes the colour whiter, increases the tenacity and elasticity, but makes it harder. In some experiments made by the author, 1 to 2 per cent of iron was found to have no deteriorating effect, except with regard to hardness, and the colour of an alloy containing 12 per cent of nickel was equal to one containing 16 per cent, in which no iron was present, the same quantity of zinc being used in each case. The metal rolled remarkably well. In the better qualities of German silver used for rolling and spinning, iron was found to be injurious, and for these purposes the purer the alloy the better it works. All..show more

Product details

  • Paperback | 120 pages
  • 189 x 246 x 6mm | 227g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • Illustrations, black and white
  • 1236533410
  • 9781236533418