414 Dr. J. Hopkinson and Messrs. E. Wilson and F. Lydall. 



time. Curve B gives current in amperes in terms of time, whilst C 

 is the integral of B and gives quantity in coulombs. With this fre- 

 quency and current the energy dissipated 011 resistance of the electro- 

 lyte is a large proportion of the total energy dissipated ; and only about 

 40 per cent, of the total energy is taken up in evolving oxygen and 

 hydrogen at the plate, owing to the high frequency. The reverse of 

 this is the case with lower frequency, as will be shown in connection 

 with fig. 7. 



From observations on the direction in which the electrometer 

 needle was deflected for a given position of a Clark's cell connected 

 to its terminals, we were able to state, for a given half period in 

 the curves in figs. 6 and 7, which gas was being given off at the 

 plate. 



FIG. 8. 



