336 



HENEY A. ROWLAND 



The table below gives the various results. 



Cor. 

 C. 



3323 



40 A 12741-5 



133 



40 



133 



40 



12720- 

 " 12716- 



3430-8 

 3425-8 



3448-8 

 3447-0 



1578-5 

 1578-4 



30- 

 30- 



236- 

 220- 



98- 

 93- 



1241-85 15922394- 



15775610- 



1140-8 



106 + s 1140-8 

 105 + s 



57 +s 1088-9 



58 + s '< 



3911004- 



3933354- 



1718719-7 



7397 



5-3080 

 0164 



5-3244 



5-2991 

 0164 



5-3155 



1 3050 

 0164 



1-3214 



1-3034 

 0164 



1-3198 



5653 

 0164 



5817 



3344 



3368 



3379 



3355 



3384 



3363 



3346 



This method can be used with great accuracy for the comparison of 

 the capacity of a condenser with a standard condenser. In the com- 

 parison, first one condenser and then the other would be placed in the 

 R -f- r circuit. If the two condensers are of nearly the same capacity, 

 the degree of accuracy of the comparison depends upon the accuracy 

 with which R" -f- r' can be set. The degree of accuracy of setting 

 R" -f- r' varies with the value of the self -inductance with which the 

 condensers are compared. In the experiments just given, using the 

 different coils, the degree of accuracy with which two ^ microfarad con- 

 densers could have been compared would vary from 1 part in 2000 to 

 one part in 14000. The two condensers are supposed to be without 

 absorption, as its presence would cause trouble unless the absorption 

 resistances were known. 



