MORSE AND SHUDDEMAGEN. — AN ALUMINIUM ANODE. 



385 



the curves we have plotted there is, however, a perfectly definite 

 curvature near the beginning of the curve. This point will probably be 

 found of importance in the study of the efficiency of aluminium con- 

 densers. It is evident from the data at hand that the separation of 

 the effect of capacity from the effect of resistance can probably not 

 be carried out by ballistic measurements on these films. One method 

 which would probably be successful in the separation of these two 



.10 



.08 



O .06 



o 



< 

 a. 



s 



.04 



,02 



86 



60 



75 



VOLTAGE 



Figure 14. 



Capacity vs. voltage (below forming voltage) for various insulation times. 

 Curves for times .002 seconds, 0.3 seconds, 2.0 seconds, and 5.0 seconds. 

 Lower range of voltages. 



factors would involve the study of resonance conditions in circuits 

 containing capacity, resistance, and inductance. 



6. Variations in Both Charging Time and Insulation Time. — We 

 have collected a large mass of data on individual cases in which both 

 charging time and insulation time are varied. This data does not ap- 

 pear at present to be of sufficient value to warrant publication as a 

 whole. The general course of the curves is shown in Figure 17, and 

 the times are indicated below that figure. Several of the facts already 

 mentioned are evident from this figure. The variation in capacity 

 below forming voltage is clearly seen, and the change which takes 

 place as the insulation time is increased is also plain. Similar curves 

 VOL. xliv. — 25 



