FOB PLEASUBE AND PEOFIT. 



63 



and biggest screens in this country, and I have never known 

 him to make an indifferent job of any of them. 



But there is a simple yet important matter in connection 

 with the construction of these biig 1 river screens that may well 

 be referred to and illustrated, if only because it embodies a 

 principle which applies to all screens, little or big. And this 

 is the correct angle ai screen should assume across a river. I 

 have had occasion already to point out that the wrong way to 

 put up a screen is at right angles to the banks. The correct 

 way is shown in Fig. 19. A ig the screen, placed at an obtuse 



.19. 



Fig. 19. Plan of Arrangement of River Screen. 



and acute angle across the stream ; B is a plank or, for pre- 

 ference, a strong fir-pole moored partly across the stream by 

 means of a chain, D, and kept parallel, or nearly so, to the 

 screen. The direction of the current is shown by the arrows, 

 E E. Any debris coming down stream, especially heavy, float- 

 ing weed,, etc., strikes against B, and is naturally drawn in 

 the direction shown by the small arrows, a a ; that which 

 escapes under the pole or plank B finds its way to the screen 

 A, but here again ig drawn in the direction of the 

 small arrows, b b; only the water flows freely through 

 all in the direction of the arrows, E E. At c a 

 channel is cut and a sluice put up. The channel may 

 lead to a surplus water channel or into another stream, 

 or it may join the main river at a convenient point below. 

 This arrangement has been shown again and again in previous 



