486 BELL SYSTEM TECHNICAL JOURNAL 



Conclusion 



It is concluded that the theory developed provides calculated results in 

 satisfactory accord with experiment. 



It will be recalled that the approximation was initially made that the line 

 sections were loss free. The theory could doubtless be extended to include 

 dissipation by retaining a small real component in the propagation constant 

 P of Fig. 2b. Xo doubt this real component could, in turn, be included to 

 adequate accuracy in the equivalences of Fig. 2c by the addition of real 

 components in the series arms only. That is, the series arm for a X/4 sec- 

 tion would be Z (r + jl) = r Z -\- j Z where r <<C 1. Since such terms appear 

 as part of the (5+2 F)'s in the basic determinant II — 1, which is the same 

 as in series with the Zo's in determinant II — 2, the inclusion of dissipation 

 would appear to be formally straightforward. 



