MEASUREMENT OF CAPACITANCE 



429 



TABLE II 



Determination of K at 1000 Cycles 

 Those readings made on any given day are grouped together. 



n = no. of observations 



d = deviation from mean 





not defined until 

 Table 6. 



Av. 1.00028 

 <r .000047 

 3a- .00014 



Final Value of K 1.00034 ± .00003.* 



To determine the effect of any inequality in the ratio arms of the 

 bridge tests were made first with the series circuit in one arm of the 

 bridge and then in the other at the time of each series of tests. In 

 each case the reversal was found to cause a change of +.008 per cent 

 in the value of K. Hence, the error in the determinations caused by 

 all bridge inequalities was assumed as —.004 per cent; i.e., .004 per 

 cent should be added to all determinations. 



* The final value was obtained by adding .00002 for a known error in frequency 

 and .00004 for the ratio arm error of the bridge to the average of the above determina- 

 tions. The accuracy of the final value is equal to ± — = . 



