MORSE AND SARGENT. — RESISTANCE OF LEAD ACCUMULATOR. 607 



temperatures. The points of special interest to be noted are the 

 higher resistance of the cell and the smoothness of the curves. These 

 pasted plates were made to have as nearly as possible the same ca- 

 pacity as the Plants cell at the 2-ampere discharge rate. 



12. The course of the resistance of our Plants cell at constant 

 temperature, but at various rates of discharge, is clearly shown by the 



2.0 



uj 

 O 



O 



IS 



Id 



1.7 



20 



i^ 60 GO 100 120 



TIME-hlNUTES 



Figure 10. Voltage and resistance during partial discharge followed by 



recovery. 



curves of Figure 9. It should be noted that these curves could be used 

 as criteria of cell condition quite as well as voltage curves — and that 

 the cell capacities corresponding to the different rates are clearly given 

 by a statement of the cell resistance, corresponding to the rate in 

 question, at which discharge must be stopped. 



Recovery. 



13. Curves showing resistance and voltage during partial discharge 

 and subsequent recovery on open circuit are given in Figure 10. These 

 curves are characteristic of the general shape of all recovery curves. 



