512 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



per cent, of soft iron, 2-J- of tungsten, and \ of nickel. 8 C\ 

 December 25, 1874, 436. 



ALLOY RESEMBLING SILVER. 



An alloy, said to resemble silver, is prepared, by Pirsch- 

 Baudoin, of Paris, from 71 per cent, of copper, 1.65 of nickel, 

 1.75 of cobalt, 2.5 of tin, 1.25 of iron, and 7 of zinc. Some 

 aluminium (about 1^ per cent.) may also be added. The 

 nickel is first melted with an equal amount of copper, and 

 the zinc in the proportion of 6 parts of zinc to 10 of copper. 

 The iron, the rest of the copper, and the cobalt (in the form 

 of oxide) are then fused at a high temperature, in a graphite 

 crucible, with the first alloy and charcoal, under a cover of 

 charcoal. To this the zinc, alloyed with copper, is added 

 when the temperature has fallen to a point at which it will 

 simply melt. The crucible is then removed from the fire, 

 and the contents are stirred with a wooden rod, and the tin 

 wrapped in paper added, and the mnss stirred again and 

 poured out. Most of the zinc volatilizes in the operation. 

 6 C, February 22, 1874, 352. 



GLAZE FOR EARTHENWARE. 



The glaze prepared by the following process, by Conslan- 

 tin, is said not to be perceptibly affected in 48 hours either 

 by cold or hot vinegar containing 8 per cent, of acetic acid, 

 while it has been found in practice to be about 12 per cent, 

 cheaper than the ordinary lead-glaze : 25 parts of red-lead 

 and 10 parts of finely pulverized quartz are carefully stirred 

 into a 50 per cent, solution of soda water-glass. It is laid on 

 with a brush, either once or twice, with an interval of 12 

 hours, and is burned as usual. 6 C, May 7, 1874, 188. 



NEW PROCESS FOR NICKEL PLATING. 



Martin and Delamotte use organic acids with the salts of 

 nickel, instead of the mineral acids usually employed. The 

 bath is prepared by dissolving 3858 grains of citric acid, 1543 

 grains of sal ammoniac (or sulphate of ammonia), and 1543 

 grains of nitrate of ammonia in 6.3 pints of water, heating 

 the solution to 176, gradually saturating it with freshly pre- 

 cipitated hyclrated oxide of nickel, and then allowing it to 

 cool. One pint of ammonia is next added, and the whole di- 



