in Cells for Direct and Alternate Currents. 



333 



1 ampere, the temperature of the cell having risen. The plate 

 formed in alum solution only allowed 0'083 ampere to pass. The 

 two cells were then placed in series and left for 13 hours, with 

 gSj- ampere passing from the aluminium to carbon plates in each. 



The following test was then made. The cells had opposed to 

 them, aluminium to positive, in turn from 1 to 20 storage cells, 

 without extra resistance, rising a cell at each step, the resulting 

 current and potential across the terminals being noted. The results 

 are given in Table II. We see that from 1 to 18 storage cells the 



Table II. 



currents gradually increase in each, the plate formed in H 2 S04 

 having an apparent greater resistance, up to about 16 cells. With 

 20 cells applied the H 2 S0 4 -formed plate gave way with great 

 rapidity, and in a very short, time, about fifteen seconds, the current 

 was 4 amperes, the temperature of the cell rising also from 21 C. 

 to 23 C. The alum-formed plate seemed more stable with 20 cells, 

 but speedily allowed a current of over 1 ampere to pass. On going 

 back to 16 cells the currents were 0'9 ampere in the HjSCVformed 

 plate, and 0'29 ampere in the alum-formed plate. 



