MOVEMENTS OF ATMOSPHERE GULDBERG AND MOHN 



1 73 



ing therein this value of f(z) into equation (4) and placing p = p' 

 we shall have 



^0= V 2 



g z - 



T — T ' 



1 M 



T ' 



We see therefore that for small altitudes the coefficients m and m' 

 do not appear in the formulas, that is to say the latent heat of the 

 vapor of water plays no part in this case. The formula is identical 

 with that for the velocity of the air in a chimney (fig. 14) when we 

 neglect the friction. 



-r 



~?K 



i\ 



~u; 



-4m 



FIG. 14 



Supposing the air to be dry, the virtual temperature is equal to 

 the absolute temperature, that is to say T = 273 + t and T Q ' = 

 2 73 + T o'- F° r this case we have calculated the following table 

 assuming r = 20. ° 



Table III. 



Horizontal velocity in small whirlwinds, 

 vertical current 



z = the altitude of the 



