﻿486 Prof. C. A. Skinner on the Evolution of Gas 



as in the preceding figures. Fig. 4 exhibits the results with 

 one milliampere in both helium and argon. Both sets of 

 results follow the direction of the line closely, helium showing 

 here again a slight excess, while argon holds closely to F 

 until depletion makes itself evident. In fig. 5 the results 



Fig. 4. 



0.Z 



uo.1 







s so 



Duration of Current (Minutes) 



Fig:. 5. 



OA 



0.3 



1*2 



Oil 



/o 



/S 



Duration of Current (Minutes) 



from the two samples of magnesium tested in argon, under a 

 current of two milliarnperes, serve to show the extent of 

 agreement with Faraday's law, and also that within the errors 

 of observation the values from two different samples are 

 identical. They show further that magnesium does not 

 possess as great a supply of available gas as aluminium. 



The experiments with both kinds of metal support the 

 assumption stated at the beginning, namely, the rate of evolution 

 of gas from the cathode is the same irrespective of the gas-filling 



