Wave Propagation over Parallel Wires. 



629' 



The correction factor C may be calculated from the 

 asymptotic formula V instead of II or III under the fol- 

 lowing condition and in accordance with the following 

 rule:— If the series l + k 2 s 2 + ¥s*+ . . . converges to a 

 required order of approximation in a finite number of 

 terms n, then formula V may be employed, provided that 

 6^n 2 >5. 



The auxiliary functions involved in the foregoing formula? 

 have been computed and are plotted in the accompanying 

 curves, the accuracy of which is believed to be sufficient for 



Fiff. 3. 



0.6 



0.5 



0.4 



0.3 



0.2 





\blues 



of A uxilia 



V\{ , w z , w 



y Functio 



->s 





























Wz^ 



















y 







/ 





Wy> 





s 







/ 





Wi, 







y. 



^ 













Va/ues of b = a ^Anhpp 



all engineering purposes. An example of their use will now 

 be given in calculating the correction factor C for the 

 following representative case : 6 = 5 and 2& = 2a/c=0 , 75. 

 From the curves of fig. 3, 



Wi 



— 



0-605 



W<2 



= 



0*410 



w 3 



=: 



0-235 



Wi 



= 



0-130 



Phil. Mag. S. 6. Vol. 41. No. 2 14. April 1921. 



2T 



