ij*JS?Vj(l 



Fig. 3 



SHADOW OF THE BALLOON ON AN ALFALFA FIELD 



9:02 A.M. FEB. 12, 1921, ELEVATION ABOVE GROUND, 250 FT. 

 CAMERA FACED NORTH. 



The shadow shows the balloon, basket and flag. By means of the shadow it was 

 possible to estimate quite accurately the speed of the balloon and the direction of the 

 movement. 



16 



