146 



MILLIKAN— METEOROLOGICAL WORK 



Corps. These tables show air currents increasing in intensity with 

 increasing altitude and approaching the huge speed of lOO miles 

 per hour. Such speeds are perhaps exceptional, but not at all un- 



TABLE H. 



War Department, Signal Corps, U. S. Army, Meteorological Service. 



Station Groesbeck, Texas. (90th Meridian Time.) 



Wind Aloft Report. 



Time 7:00 A.M. Date November i, 1918. 



known. The pilot balloon mentioned in 3 travelled from Omaha 

 to Virginia at an average speed of thirty miles per hour, the average 

 height being 18,000 feet. On November 6, 1918, at Chattanooga, 

 Tennessee, a velocity of 154 miles an hour at an altitude of 28,000 

 feet was observed by one of the meteorological units of the Signal 

 Corps. 



These facts bring out the importance of a forecast of such cur- 

 rents for the purposes of long flights. A flier aided by such a wind 



