﻿42 
  REPORT 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  

  

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

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

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

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

  

  Scale 
  of 
  feet. 
  

  

  Wire 
  Filter. 
  

  

  -T{ 
  

  

  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 
  

  

  