I 



HIGHEST REGISTERING 



BALLOON REACHED 



22 MILES 



TEMPERATURE REMAJHS 

 THE SAME FROM 6 MILES 

 UP TO ZZ MILES AT LEAST 



AVERAGE HEIGHT REACHED / 



BY REGISTERING BALLOONS 



10 MILES 



HIGHEST AEROPLANE FLIGHT 

 +08OO feel- at DAYTON U.S.A.I92I 



No Clouds above th/s neighf 

 APPROXIMATE HEIGHT OF BASE OF STRATOSPHERE 



HIGHEST MANNED 

 BALLOON. KHUN 1901- 



MOUNT EVEREST Temperature -Z7F 



THE ATMOSPHERE AND HOW IT HAS BEEN EXPLORED 



The diagram shows the heights of some well-known mountains, and the average heights 

 of certain cloud-types. It also shows what heights have been attained by various methods 

 of ascent. The dotted line shows the average height of the dividing line between strato- 

 sphere and troposphere in our latitudes. 



