SHUDDEMAGEN. 



RESIDUAL CHARGES IN DIELECTRICS. 



477 



that there may be considerable difficulty in defining the so-called " free 

 charge capacity " of the test condenser. It seems to me that this term 

 can only be safely used when it can clearly be shown that the charge 

 from a condenser, with constant charging voltage, approaches a definite 



TABLE I. (Figure 2.) 



" Mica B " vs. Air. 



V = 64 volts. Total Throw = 46.5 cms. 



limit as the charging time is continually decreased toward zero, or, 

 rather, as close to zero as the conditions for complete charging will 

 allow. Considerable light will be thrown on this question, I hope, by 

 the later experiments in this work. For the purpose of constructing 

 Tables I, II, and III and the curves of Figure 2 the simplifying assump- 

 tion is in general made in this work that no residual charge is formed 



