X ,-X-X. 



3 5 4 



i — i — r 



_L i 



(b) 

 Figure 27-12. 



given the positive sign while those values read on the right hand side will be 

 given the negative sign. For the terms containing In, vertical rectangles are 



used and values of 



x°~ + 



read at the upper end of the rectangles have the 



positive sign and values read at the bottom end the negative sign. 



Example: Suppose the cylinder to have a circular cross section, its radius 

 to be 100 meters and its axis to be 250 meters below the surface of the ground. 

 Suppose further that its axis runs east and west and that its magnetization 



603 



