Alternate Current Electrolysis. 



411 



FIG. 5. 



quantity of electricity in coulombs. The area of each curve (see 

 Table I) is a measure of the energy dissipated per cycle, and since in 

 this case there can be no accumulation of recoverable energy at the 

 end of the cycle, it follows that the whole difference between what is 

 spent during one part of the process and what is recovered during 

 the other part is dissipated. In order to obtain an idea of the effi- 

 ciency to be looked for when used as a condenser with platinum 

 plates |- in. apart and dilute sulphuric acid, under varying conditions 

 as to maximum coulombs, the area ABC (Curve 1, fig. 5) has been 

 taken and is a measure of the total energy spent upon the cell ; whilst 

 the area DBC is a measure of the energy recovered the ratio of 

 these areas gives the efficiency. 



Part II. In the next set of experiments the frequency was varied, 

 in addition to current ; and in order to allocate the losses of poten- 

 tial in the cell, the platinum plates were placed j- in. apart for the 



