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PROCEEDINGS OF THE AMERICAN ACADEMY. 



Figure 21 has apparent capacity, insulation time, axid forming volt- 

 age as its co-ordinates, the charging voltage being that of formation. 

 The heavy curves are similar to those of Figure 13, and the dotted 

 lines are now A curves of Figure 2, since capacity is measured at the 

 voltage of formation. 



Finally, in Figure 22 we have plotted the apparent charge of a plate 

 formed at various voltages, and measured at various voltages below 



o 



< 



D- 



VOLTAGE 



Figure 17. 



Capacity vs. voltage (below formation voltage) for various time combi- 

 nations. 

 Curve A. Charging time, long. Insulation time, .002 sec. 



B. " 0.5 sec. 



C. " 0.16 sec. " 



D. 

 E. 



long, 

 long. 



that of formation. The full curves are somewhat like those of Figure 

 4 and the A and B curves of Figure 17. This means that the plate 

 (average formation assumed) is being given a fairly long charge and a 

 short period of insulation. The curves, therefore, will in general rise at 

 rather low working voltage, and the sheet will be somewhat hollow. 

 The projections of these curves are indicated on the plane at the left. 

 These curves have not the same numerical value as those of Figures 4 

 and 17, but they are somewhat similar in shape, the ordinates being 



