500 



and 



BELL SYSTEM TECHNICAL JOURNAL 

 Za = {R + iL'<^)l, 

 Zb = 1/(G' + iC'oo)l. 



(88) 







sooo 



3 



Frequency (cydes per second) 



Fig. 24 — Propagation characteristics of 10-, 20- and 30-mile lengtiis of 104-mil 



open-wire smooth line and of the simulating artificial smooth lines. 



{R' = 10.12 ohms, L' = 3.66 mh., G' — 3.20 micromhos (wet weather), and C = 



.00837 mf. per loop mile.) 



