276 



National Resources Planning Board 



Bicircular Coordinates 



Figure 85 

 {x-\-coth uy-\-y'^=csch^ u; a;^+(y— cot 0)^=csc'0 

 u=log irjr^) 



Using the bicircular system of coordinates facilitates finding the distribu- 

 tion of electric charge on two parallel conductors, and thence their 

 capacity. Rotating the bicircular system about the vertical axis gen- 

 erates a toriodal coordinate system which facilitates determining the 

 capacity of a torus. 



