122 



WAVES OF THE SEA 



The oval indicates the area covered by the 

 depression, the long arrow the direction of 

 advance, the short arrows the direction of wind 

 in certain parts of the cyclone. In the position 

 marked A the direction of the wind is contrary 

 to the direction of advance of the cyclone. Hence 

 in this quadrant the cyclone is continually re- 

 ceding from the waves which its wind creates, and 



A CYCLONIC SYSTEM. 



along the line of advance of this part we should 

 not expect that there would be any great develop- 

 ment of waves, even if the winds there were strong, 

 which they are usually not. Obviously, for a given 

 velocity of wind, the position most favourable to the 

 development of waves is that where the direction 

 of the wind coincides with the direction of advance 

 of the cyclone. This is where the direction of 



