SHUDDEMAGEN. — RESIDUAL CHARGES IN DIELECTRICS. 501 



the difference between this standard R, and the E, corresponding to any- 

 other charging interval and calling this difference d, I got (x + d) for 

 the residual charge which formed in the other interval. I then divided 

 all the numbers (x + d) by the total charge per volt which went into the 

 test condenser in the shortest charging time. This gave numbers which 

 are independent of the apparent capacity of the test condenser used. 

 When multiplied by 100, these give the residual charges formed in the 

 given charging times, expressed in percentage of the total charge 

 formed in the shortest time. 



Thus in Table XXVI we have for the condenser " Par. A " a capacity 

 of 0.0404 mf., or 0.554 cm. when expressed in ballistic throw per 

 volt, Then for " Par. A," let x (100)/0.554 = y. Then for"' 1 width " 

 of charge (af + O.0Q44)(10O)/0.554 = y + 0.80 ; and the number (y + 

 0.80) will be the residual charge which forms in the charging time of 

 0.O0020 second, expressed in percentage of the total charge formed in 

 the condenser "Par. A" in the charging time 0.00005 second. We 

 shall express the results obtained in the (y-\-d) form for all the test 

 condensers, but must remember that the y is in general widely differ- 

 ent for the different condensers. We thus obtain the following table : 



TABLE XXXIII. (Figures 5, 6, and 7.) 



Residual Charge in Percentage op Total Charge. 



March 10, 11, 1908. Temp. = 22°-23°. 



A great difference will be immediately observed between the paraffin 

 condensers and the mica condensers. The variation is large in the 



