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



To make this measurement I have found it convenient to use the 

 apparatus described below, as it is necessary in collecting the 

 carbon dioxide gas to avoid its loss by solution in water, or by 

 combination with the potassium hydroxide formed at the cathode. 

 In order to avoid the former source of loss the solution is 

 previously saturated with carbon dioxide gas, and to prevent loss 

 by the latter the electrolyte is kept moving from the anode 

 towards the cathode. 



The apparatus consists of a measuring tube AB standing 

 vertically with an electrode of carbon formed from a piece of an 

 arc-light carbon 1 . At the side opposite the carbon is joined a 

 horizontal tube which at the open end is bent upwards, and into 



which the platinum cathode dips. A fine tube 0, blown into the 

 glass just above the platinum plate, serves as an outlet for gas or 

 liquid. In commencing an experiment the tube G is connected 

 by a rubber tube to a tall reservoir BE, and potassium perman- 

 ganate solution, almost saturated, is poured in at E until it nearly 



1 In some experiments rods of gas-carbon cut from the part next the walls of 

 the retort were used. The results did not differ from those obtained with arc-light 

 carbons. 



