H. A. Rowland — Electrical Measurement. 437 



In methods 1 to 14 inclusive the concentric circles are the coils of the electro- 

 tlynamometer. Either one is the fixed coil and the other the hanging coil. Oblong 

 fig. ires are inductances and when near each other, are mutual inductances. A pair 

 of cross lines is a condenser. 



