54 BELL SYSTEM TECHNICAL JOURNAL 



This impedance bridge arrangement employs several features which 

 are a distinct improvement on the methods previously utilized for this 

 purpose. In order that the impedance angles of the impedance net- 

 works may be balanced, a variable resistance has been connected in 

 that branch of the bridge which contains the comparison capacitance. 

 This balance of the impedance angles of the impedance network was 

 found to be important in obtaining a steady performance of the alter- 

 nating-cuirent galvanometer. A system has been devised for sepa- 

 rately balancing the resistance components as well as the capacitance 

 components of the reactive networks of the impedance bridge. It 

 was found that this arrangement gives a maximum sensitivity to each 

 component and permits of a very rapid balance of the bridge. 



