6o 



THE NEW WORLD OF SCIENCE 



the air in which he flies, it will be seen that it is of the greatest 

 importance to him to know the nature of the currents at dif- 

 ferent levels. Table 4 furnishes a very typical illustration of 

 this importance. From the above data it is evident that an avi- 



TABLE 5 



WAR DEPARTMENT, SIGNAL CORPS, U. S. ARMY, METEOROLOGIAL 



SERVICE. 



Station Fort Oglethorpe, Ga. (ooth Meridian Time.) 



Wind Aloft Report. 

 Time 7 :3Q A. M. Date November 29, 1918. 



TABLE 6 



ator flying toward the west at this time and place should have 

 flown at an altitude of 1,000 meters, while an aviator flying 

 toward the east should have flown at an altitude of 4,000 

 meters or more. 



In order to meet the obvious need of the aviator for a knowl- 



