LONG-WAVE RADIO TRANSMISSION PHENOMENA 



TABLE I 

 Rocky Point-Houlton- 



-18.8 Kc. 



Distance 700 Km. Average Minimum 13 Db Below Field Immediately 

 Preceding Drop 



TABLE II 



TUCKERTON-HOULTON- 



-18.4 Kc. 



Distance 900 Km. 



Average Minimum 7.9 Db Below Field Immediately 

 Preceding Drop 



The 18-kc. Tuckerton-Houlton 900-km. path of nearly the same 

 azimuth as the Rocky Point-Houlton path, showed a minimum occur- 

 ring irregularly at from 31 to 62 minutes, or an average of 51 minutes 

 after mid-path sunset, corresponding to an average sun's altitude of 

 - 9.5°. Since the data of Table II are subject to the errors inherent 



