MORSE AND SHUDDEMAGEN. — AN ALUMINIUM ANODE. 391 



Figure 22. 



K = CV vs. voltages for plates formed at various voltages. The curves 

 parallel to the plane of the paper correspond to the B curve of Figure 2. The 

 dotted lines on the YZ plane are traces of the main curves (full line) on this 

 plane. 



obtained by multiplying by a constant (the forming voltage). The 

 dotted lines will then be B curves of Figure 2 as far as they go. They 

 are of course limited by the fact that the plate is only charged at 

 voltages less than the formation voltage. 



VI. The Factors which determine Capacity. 



Summary. — It would appear that the following factors all enter into 

 what we have been calling the apparent capacity of an aluminium 

 anode : 



1. Formation voltage. 



2. Mode of formation (time, voltage-steps, etc.). 



3. Applied voltage. 



4. Time of charge. 



5. Time of insulation. 



6. Time of discharge. 



7. The electrolyte. 



8. Temperature. 



9. Electrical constants of the circuit outside the cell. 



