72 



METEOROLOGY— THEORY 



10 FEET 

 S 



10 20 30 40 50 60 70 



MILES 



90 II 110 120 120 



20 30 40 50 60 70 60 90 '00 110 120 )30 



MILES 



20 30 -10. 50 



60 70 



MILES 



90 100. no 120 130 



li) - 4*00 iJkj - Uii 



SEPT 18,44 



20 30 



50 60 70 80 90 '00 110 120 130 



MILES 



20 30 40 



MILES 



50 60 



10 20 



30 

 MILES 



50 60 



NAUTICAL MILES 



Figures. Isopleths — refractive index [(u— l)106j_ 



