20 



t9 



18 



17 



16 



15 



14 

 13 

 12 

 11 



to 



9 

 8 



7 

 6 



4 



2 



"2 



"4 



47 



46 



44 



42 



40 

 38 

 36 



34 

 32 

 30 



28 

 26 



24 



22 



I i 3 * i 



s t 1 a a 



Fig. 8. — Atmospheric transmission by short method. 



