Smithsonian Reporl, 1938. — Stetson 



Plate 2 



F OR APPLETON LAYER 200 - 500 Km 



' 120 Km 



E LAYER. OR KENNELLY-HEAVI5I0E LAYER 

 which reflects radio waves. Zone cfm;xir 



80 Km 



\ 



X 



40Km OZONE L E V E L 





X. 



STRATOSPHERE 



100 Km' 



50Km« 



Pilot ballooniO Km. 



^Settle 1931 \84Km 



« > } Highest peak 



«S^A,rpl a nel.m.H2Km -t\j 88 '• • T, 



Cross Section of Earths Crust and its atmosphere. 



