THE EFFECT OF SULPHURIC ACID ON THE DEPOSI- 

 TION OF METALS WHEN USING A MERCURY 

 CATHODE AND ROTATING ANODE. 



By lily G. KOLLOCK and EDGAR F. SMITH. 



[Contribution from the John Harrison Laboratory of Chemistry.] 



{Read November 3, 1906.) 



In the course of a study of the precipitation of metals with the 

 help of a mercury cathode and rotating anode, observations were 

 made which led to a review of the experiments to ascertain more 

 especially what effect varying amounts of acid would have upon the 

 electrolytic decomposition of certain metallic sulphates. 



The metals studied under these conditions were zinc, copper, 

 cadmium, iron, cobalt and nickel. The volume of the solution of 

 the salt was, in nearly all cases, ten cubic centimeters, containing 



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