690 



RAINFALL IX THE TRANSVAAL. 



available, and they are therefore excluded. When so divided the 

 greatest falls of not more than two hours' duration show an 

 increase of amount with respect to time which may approximately 

 be connected by an expression of the form : — 



h 



a (loK/)" 



The most probable values of the constants having been cal- 

 culated from the data, the following equations are obtained : — 



3n8i\ogj\ 



'318 



2 5SC) 



■436 



■tun 



C-v) 



Eastern Division. 

 Central Di\ ision. 

 South-Western Di\'ision. 



Easthkn DnisioN. 





Fig. 5. 



where h is amount in hundredths of an inch and / time of dura- 

 tion in minutes. These are the equations to the curves of Figs. 3-5, 

 some values of which are here given against actual amounts 

 recorded : — 



