14 



BELL SYSTEM TECHNICAL JOURNAL 



Long Transmission Paths 



An examination of long-distance data of Tables III and IV discloses 

 the following facts regarding these phenomena. 



TABLE III 



Nauen-Houlton — 23 Kc. 



Distance 5600 Km. Average Minimum 13 Db Below Field Immediately 

 Preceding Drop 



Distance 5172 Km. 



TABLE IV 



Rocky Point-Cupar — 60 Kc. 



Average Minimum 25 Db Below Field Immediately 

 Preceding Drop 



Rocky Point-Cupar 60-Kc. Path, Table IV 

 1. Minimum field does not follow surface sunset at any point on 

 the transmission path by a constant time interval independent of 

 season. 



