Scott. — Quieting the Flow of a Stream of Disturbed Water. 499 



After being roughly quieted by ordinary methods, the water is passed 

 through a vertical screen (fig. 3) consisting of bars of fish-shaped section, 

 the up-stream end of each being convex and one-third of the total length, 

 the down-stream end being concave and terminating in a knife-edge. There 





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Fig. 2. — Action of perforations. 



Fig. 3. — Action of improved grating. 



is thus no dead-water, and the formation of eddies from this source is pre- 

 vented, whilst eddies previously existent are destroyed by the water being 

 streamed through cross-sections which first gradually decrease and then 

 gradually increase. 



One such screen has proved sufficient for the author's purposes, but 

 in some cases it is possible that the addition of a second screen at right 

 angles to the first might be desirable. 



