42 



REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



The wire filter illustrated has to pass some 500 gallons of water per 

 minute, and lias three screen-boxes, each of which carries 5 to 7 screens 

 about 2 feet wide and 4 feet long; the meshes are from 2 inches down 

 to ^ inch square, and therefore intercept all coarse debris. 



*^ 



Scale of feet. 

 — 1 ■ i - 



Wire Filter. 



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It is but the work of a few moments to reverse the current and 

 thoroughly cleanse the screens; when the autumn leaves are falling 

 this must be done several times a day, but at other seasons some days 



