on the Faure Accumulator. 43 



is to be noticed that during charging V' is less than V, whereas 

 on discharging V is greater than V. 



An examination of thirty-five sheets of time-curves, which 

 we have drawn from the experiments we made, shows that, in 

 charging, the curve for AV rises at first ; and as it rises 

 more rapidly than that for AV', this means an increase in the 

 resistance of the accumulator. 



I 



X 



si 



As the charging continues, the two curves for AVand AV 7 

 approach one another, showing that the internal resistance of 

 the accumulator diminishes again. On the other hand, at the 

 end of a long discharge the curve for AV falls more rapidly 

 than that for AV', due to an increase in the internal resistance, 

 Now our experiments show a great constancy in the electro- 

 motive force of a Faure cell, and that the falling-off in dis- 

 charging which occurs during a very rapid discharge, or at 

 the end of a long discharge, is due more to an increase in the 

 internal resistance of the accumulator than to a diminution in 

 the electromotive force, which our methods of experimenting 

 above described enable us to separate and measure inde- 

 pendently. But, whether discharging rapidly or whether 

 discharging slowly, there is a most curious resuscitating- 

 power in the cell, which, if disregarded, will cause totally erro- 

 neous underestimates to be made of the efficiency of the cell. 



This resuscitating-power is more marked for rapid discharges 

 than for slower ones. In the case, for example, of an ex- 

 tremely rapid discharge, we found that when the flow had 

 become apparently so feeble that the cell appeared totally dis- 

 charged, leaving the poles of the cells insulated caused three 

 times as much electric energy to be given out all together in 

 the second discharge as had been given out in the first. And 

 even when several days are taken to discharge the cell — and 

 we may mention that we have had continuous observations 

 made day and night for several days in certain cases — this 



