FOR HUiH LKVEI,S IN THE EARTH S ATMOSPHERE. 



Table 2. 

 Gravity-potential Table foe Omaha, Nebk. 



37 



By linear interpolation in this Table we obtain Table 3 which we may designate 



as the gravity-potential table for Omaha, since V is identical with the potential of 



gravity according to (1). In other words by taking the derivative of that formula we 



find 



dV 



dz 



= 9' 



