274 Mr. W. Gr. Bickley on some Two-Dimensional 



Corresponding values of p and a are readily calculated 

 and the stream-lines easily plotted on tracing-paper over the 

 map above referred to. In this way figs. 1 to 4 have been 



Fig. 1. 



£ = 



Fisr. 2. 



/3=90'' 



drawn, for the values of /3, 0°, 90°, - 45°, and 60° respec- 

 tively, turned for convenience so that the undisturbed 

 direction of the stream is horizontal. The third of these 



