632 Wave Propagation over Parallel Wires. 



Substitution in formula II gives 



C = 1 + 2-45 (-U15--01223) 

 = 1-317. 



From the curve oi: fig. 1 the maximum value C m of the 

 correction factor for this case is 1-51, and from the curve of 

 fio-. 6 the value of the auxiliary function A is 0*76. The 

 asymptotic formula V therefore gives: 



C~ 1-51 (1-0-76/5) = 1-28. 



As would be expected from the magnitudes involved, the 

 asymptotic formula therefore gives a result which is in error 

 by a small amount. 



Fisr. 7. 



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To give an idea of the variation of the correction factor C 

 with frequency, it has been computed for k = 0'2o and 

 plotted in the curve of fig. 7 as a function of the argument b. 

 This case is of practical interest, since the corresponding- 

 conductor spacing is that of telephone cable circuits. For 

 this ratio of a/c the value of C m = 1*155 ; this limiting value 



