56 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 51 



and according to equation (8) the intensity of the reflections from 

 these layers h' and h" whose indices of refraction are n' and n" 

 will be given by 



2 cos 2 e' J \ 2 cos 2 e" 



If by means of a good photometer we measure the intensities J' 

 and J" , then the diminution of the refracting power between the 

 two neighboring layers at the altitudes h,' h," h'" can be computed 

 from the equations 



3 ri = 2 cos 2 *' Vj 7 , 

 d n" 2 cos 2 e" V ]» . 

 etc 



