FOR PLEASURE AND PROFIT. 



Ill 



the outer edge of the pass in Fig. 23, and it would continue to 

 " hug " that edge all through the pass, only that at the inner 

 edge of the pass the depth, is greater, as shown in the draw- 

 ing, and the* water is, therefore, encouraged to fall, as it were, 

 towards the inner edge, and, in practice, this arrangement is 

 found to effect ai pretty equal flow of water throughout the 

 entire length and over the whoJe extent of the pass. 



This the correct principle of an efficient fish-pass has been 

 applied in a very simple form to a weir on the Cumberland 



FISH-PASS ON THE EDEN, AT ARMATHWA1TE. 



Eden, at Armathwaite. I give an illustration of this pass, 

 and Fig. 24 explains the method of adapting the principle. 

 The drawing shows the dam (or weir), and it will be noticed 

 that a sufficient volume of " dark'' water is collected and con- 

 ducted over the obstruction at a certain point so as to enable 

 the fish to run up through it. The desired result was ob- 

 tained by bolting down large pieces of timber in such a posi- 

 tion as to form a guid3 for and a means of collecting the 

 volume of water necessary for the purpose. The water enter- 

 ing at the top of the pass is concentrated, and consequently in- 



