69 



great deal of accuracy is lost by neglecting the small variations in 

 conditions that usually exist below the 750-decibar pressure level in 

 the sea. 



Gi?AN 



D 



BANK3 



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SCT THPETE 



APJe/L l& TO 



-AZ^dO'N-. 



MAY 3 



Figure 16.— Current map 



Where the four-group figures are larger it means that, because it is 

 lighter, the water is puffed up so that the average height of the sea 

 surface is heaped up more above the local mean sea level than where 



Figure 17.— Current tendency diagram 



the figures are smaller. Highs in the sea are thus formed, and these 

 north of the equator, both by theory and by actual observations in 

 many open seas, have clockwise currents circling about them. These 



