MORSE AND SHUDDEMAGEN. — AN ALUMINIUM ANODE. 



387 



charging time, while the curves taken at higher voltages after very 

 slow formation show such maxima. The dotted curves are the A 

 curves of Figure 2, and it is evident that these curves may not be the 

 same over the whole sheet which they enclose. This variation, if any 

 exists, we have not yet sifted out from the mass of experimental data. 



In Figure 19 apparent capacity, discharge time, and forming voltage 

 are plotted together. At low voltages the discharge curve runs up 



1.0 



.6 



O 



o 

 o 



1.6 



I 2 3 



time • seconds 

 Figure 16. 



Test of character of leak and of formula Q 

 time. 



= Q a e vr. ■ Log Q vs. insulation 



rather slowly. As the voltage is increased the curve rises more 

 quickly and the turn toward the asymptote (full discharge) is sharper. 

 Here again the dotted lines are A curves of Figure 2, as in Figure 18, 

 and here also it seems very probable that there is variation in the 

 shape of these curves across the sheet which they enclose. 



In Figure 20 apparent capacity, insulation time, and voltage (below 

 forming voltage) are expressed in one diagram. The full curves are a 

 family similar to that in Figures 11 and 12, and the dotted curves are 

 those of Figures 14 and 15, each a line of constant insulation time. It 

 is probable that these curves turn upward rather sharply at very 

 low voltages, but we have only a few scattered observations on this 

 point. 



