138 THE MECHANICS OF THE EARTH's ATMOSPHERE. 



For cp=—r., we tberefore haTey=+;x, and the stream flows with a 

 velocity of 1 in the direction of the negative axis of 2/; for <7.= + x, we 

 have x= ifco, and ?/=-cc, and the stream flows with a velocity of I'in a 

 direction that makes an angle whose cosine is =f^- with the direction of 

 the positive axis of .r. 



In Fig. 8 the boundaries of the moving fluid are represented for this 

 -case. 



Pig. 8. 



