CHART NO. 4
Diagram Showing Increase of Wind with Elevation Data from Eight Meteorographs
From the article “Free Air Data in Southern California, July and August, 1913” by Dr. Wm. R. Blair, Professor of Meteorology, in the Monthly Weather Review, for July, 1914, it is learned that the wind shifts from west to east rather abruptly at 16 to 20 km. (10 to 12 miles); below this level down to about 5 km. (3 miles) it is quite uniformly from the west. Extremes: Maximum wind velocity 21.2 miles, 5,000 meters elevation, 5 P.M., July 24; minimum wind velocity 0.8 miles, 1,500 meters elevation, 5 P.M., July 27.
The table shows a steady increase in velocity of the wind with elevation, the data being obtained from the eight meteorographs. There were four morning flights (July 31, August 3, 7, 8) and five afternoon flights (July 24, 27, August 3, 7, 8, 1913), and elevations were computed for nine heights, 1,000 to 5,000 meters. Beyond the 5,000 meters the records show that from 2 to 7 miles altitude the wind increases at approximately the same rate that the density of the air decreases.
CHART NO. 5
Chart Showing Number of Flights and Duration in Hours for the Months of July to December, 1915, and January to August, 1916
Prepared by the War Department, Signal Corps Aviation School, San Diego, California, and furnished through the courtesy of Col. W. A. Glassford, Signal Corps, U. S. Army, Commanding Officer, September 14, 1916.
Fig. 1. Congressional Medal Awarded Wright Brothers