Mr Skinner, On the Electro-chemical equivalent of Carbon. 263 



fills the gas tube AB, the stopcock being left open. The current 

 is now started and bubbles of carbon dioxide form on the carbon 

 rod. These bubbles, however, are dissolved as they ascend through 

 the solution above the anode. At the cathode hydrogen escapes 

 through the side tube G, and passes up the tube BE. The 

 current is maintained until the liquid is saturated with carbon 

 dioxide, which will then be seen escaping from the surface of the 

 liquid through the open tap. 



The apparatus is now ready to commence a measurement. 

 The stopcock A is closed and the reservoir BE is discon- 

 nected at G. A water voltameter is put in series with it, so 

 that the same current passes through the two voltameters. If the 

 current be started carbon dioxide is collected in AB and displaces 

 the permanganate solution which escapes at the side tube G, 

 together with the hydrogen from the cathode. As this displace- 

 ment goes on during the whole experiment the potash formed at 

 the cathode is carried away. 



Table I. 



