i5° 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 51 



at this latitude the deviation is nothing, then it turns to the left. 

 In nature, the monsoon called the west monsoon in the Indian 

 Ocean follows this law during the winter. 



We will apply our formulae to numerical examples that we can 

 compare with the charts of general winds. Among these we mention 

 especially the excellent charts published by the Meteorological 

 Office at London, under the title "Monthly Charts of Meteorological 

 Data for Square 3 : published by authority of the Meteorological 

 Committee." These are in fact those charts that have led us to 

 establish the theory of winds crossing the equator presented in this 

 paragraph. We have developed the preceding formulae by sup- 

 posing that the gradient coincides with the meridian; approximately 

 we may apply them to the cases in which the angle between the 

 meridian and the gradient is small. In the first example that we 

 shall compute we assume this angle to be 20 as we see it in fig. 6. 



Applications 



(1) The gradient is northerly {see fig. 6). 

 Let 



0o - 0°, 

 v cos (/> — 10 m , 



k = 0.00002, 

 x = 20°; 

 we shall find 



e = 4° 13'.2 

 and the following values: 



(2) The gradient is southerly {see fig. 7). 

 Let 



6>„ = 0°, 

 v cos <p = 5 m , 



k = 0.00002, 

 t = 20°; 

 we shall find 



e = -2° 15 ; 

 and the following values: 



