FOR HIGH LEVELS IN THE EARTH S ATMOSPHERE. 



61 



The Values of 



Table 



(, — 50 

 509.4 



13. — Concluded. 



(e;:). 



FOR Values of u an 



^•D {K^.o- 



IV. The Relative Positions of the Isobaric Surfaces and the Level Surfaces 



OP Gravity Under Dynamic Conditions. 



Experience has shown that the formula for static barometric conditions, viz., 



dp = pd V, 



also obtains very closely indeed for the actual dynamic conditions. In the succeed- 

 ing pages 1 shall assume this formula to hold true since thereby the calculations ai-e 

 simplified and more clearly apprehended. 



The primary cause of all atmospheric movements consists in the fact that on 

 account of the unequal heating of the atmosphere the surfaces of equal values of t^ do 

 not coincide with the level surfaces of gravity. The immediate consequence is that 



