The Sheep-Fluhe. 



15 



This article cauuot be devoted to engineering, but a few suggestive illus- 

 trations are added to sbow bow a watershed may be secured in various 

 situations where there is no natural hollow. The simplest case is shown in 

 Fig. 11, where the water on a uniform slope is gathered into a tank by simple 



Fig. 12.— A tank, d, is iilled from races running round tiie two hills a and b. The tank-water is 



then siphoned into the trough e. 



forked races. A second case, Fig. 12, is less simple, showing how wator 

 naturally running away from the tank may be turned to account. An 

 apology seems almost necessary for introducing explanations of such simple 



Fig. 13.— The water in the d.ani a a is caui^iit on the fenced-off area shown, and then siphoned by 

 moans of galvanised piping into the trough h. The hollow floating ball c opens and closes the 

 taj) d automatically. In )iractice, tlie parts c and d would be boxed in. Tlic same trougli can be 

 made to serve several paddocks which corner together, by placing it under the fence. 



devices, and it may be found in the general disregard with which these 

 methods meet among pastoralists. 



Having now outlined ?ome of the principles by means of which a tank may 

 be located almost at will, at least in hilly or undulating country, let us see 

 what advantages may accrue from this choice. Foremost among these is the 

 ability to keep the water free from the larvae of parasites. This may be done 



