5Q 



DYNAMIC METEOROLOGY AND HYDROGRAPHY. 



The curves of equal intensity must therefore be closed around the neutral 

 points and around the points of convergence and divergence, and make a bend as 

 they pass lines of divergence or of convergence. This bend may be very slight and 

 impossible to discover by the observations when the lines of flow have a slow con- 

 vergence toward the singular line. But in the case of rapid convergence the bend 

 should come out strongly. 



Fig. 49. Complexes of singular points. 



A. Neutral point and point of divergence. 



B. Neutral point and point of convergence. 



C. Line of flow branching out into several lines. 



D. Lines of flow joining into one. 



129. Complexes of Singular Points. When good observations are at hand, it 

 will generally cause no greater difficulty to discriminate the nature of the singular 

 points as long as they are separated from each other by sufficiently large spaces; 

 but it may be more difficult when singular points of different nature appear close 



