FOR HIGH LEVELS IN THE EARTH S ATMOSPHERE. 



Table 5. 

 Dkcrbase of Gravity with Elevation Above Sealevel. 



41 



Elevation. 



Decrease. 



Table 4 shows the acceleration of gravity at sealevel, and Table 5 the decrease in 

 the acceleration of gravity with elevation above sealevel calculated according to formula 

 (6). To find the value of ^ at the surface of the earth, for instance at Omaha, by the 

 aid of these tables one first seeks in Table 4 for the value of g at sealevel for the lati- 

 tude of Omaha (X = 41° 16') and finds it to be 32.162. From this value one then sub- 

 tracts the correction 0.002 given in Table 5 for the elevation {z=\ 241 feet) above sea- 

 level ; hence the value 32.160 for g at the surface of the earth [i.e., the geoid] at 

 Omaha. 



When one would consider the influence of the topography of the earth's sui'face 

 on the dynamic meteorological processes he constructs charts having lines of equal 

 values of V^ instead of contour lines of equal elevation above sealevel. Such charts 

 of lines of Fq may be easily constructed from the contour charts by means of Table 6, 

 which gives the elevations above sealevel of the lines Fq = 10 000, Vq = 20 000, etc., to 

 Vo= 150 000, for each 10° of latitude, north or south. 



Table 6. 

 Elevations Above Sealevel of the V^ Suufaces foe Each Ten Degrees op Latitude. 



