RICHARDS, COLLINS, AND HEIMROD, — COPPER AND SILVER. 137 



Comparison of the ordinary Silver Voltameter with the Copper 

 Voltameter saturated with Cuprous Salt at 0°. 



than the average of the forty observed results in cupric solutions, and 

 0.016 per cent higher than these results after correction. As far as the 

 copper deposit is concerned, this result is certainly the upper limit of the 

 electrochemical value, although it is still below the chemical atomic 

 weight. No experimental proof has yet been given that too much copper 

 was deposited, however. 



If the cuprous salt really carries a part of the current, it is obvious 

 that higher temperatures, involving the presence of more cuprous salt, 

 should raise the observed value still higher. This matter is tested in the 

 results which follow. 



Comparison of Silver Voltameter with Copper Voltameter saturated 

 WITH Cuprous Salt at higher Temperatures. 



This gain in the apparent atomic weight, from 63.573 to 63.615, is 

 conclusive. Even without further knowledge of the silver voltameter 

 one is able to predict with reasonable certainty that higher temperatures 



