Platers' Guide Volume 2

Platers' Guide Volume 2

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 edition. Excerpt: ...the high price of tin has suggested to us that we should not add as much tin to our mixture as we do when pure copper is used. Answer. Copper sheet. tinned on one side contains about 2 per cent. of tin (2 lbs. in 100 lbs. of sheet). Unfortunately, all makers of tinned copper sheet now use a small quantity of lead in their tin used for tinning copper. The quantity used varies all the way from 5 per cent. up to 30 per cent., depending upon the maker. As there are many uses for tinned copper l'fl which lead does no harm, it is used in such instances in as large an amount as possible. It is never used, however, over 50 per cent., and if you assume that your tinned copper contains I per cent. of tin and I per cent. of lead we believe that it will be satisfactory. You will thus save I lb. of tint to each I00 lbs. of mixture. QUESTION No, 149. I have an alloy which has a decidedly pink color. It is quite soft and tough and is in the form of sheet. Please inform me its composition..qHS' "t'!'. A mixture of 90 per cent. of copper and IO per cent. of nickel (9 lbs. copper and I lb. nickel) has a pink color and rolls into sheet readily. To reduce the pink color add more nickel. QUESTION No. 150. ln dissolving silver I notice a small quantity of black residue which settles to the bottom. In all the samples of silver which I have used I find this. ls it an impurity and can silver be obtained without it? An.'u'1'r. The residue is metallic gold. As gold is not dissolved by nitric acid it is left in this condition. All conunercial silver contains a small amount of gold which in the or(linal'_v parting processes cannot be prevented from entering the silver. As it does not dissolve it does no harm and appears to be of more

Product details

  • Paperback | 168 pages
  • 189 x 246 x 9mm | 313g
  • United States
  • English
  • black & white illustrations
  • 1236768825
  • 9781236768827