﻿204 
  REPORT 
  OF 
  COMMISSIONER 
  OF 
  PISH 
  AND 
  FISHERIES. 
  

  

  enters 
  the 
  main 
  compartment 
  from 
  below, 
  coming 
  up 
  through 
  the 
  scrim- 
  

   covered 
  bottom 
  into 
  the 
  movable 
  box. 
  

  

  The 
  partition 
  forming 
  the 
  ])ocket 
  at 
  the 
  lower 
  or 
  front 
  end 
  of 
  the 
  box 
  

   only 
  extends 
  to 
  within 
  li 
  inches 
  of 
  the 
  bottom, 
  leaving 
  a 
  space 
  

   through 
  which 
  the 
  water 
  runs 
  from 
  the 
  compartment. 
  In 
  the 
  bottom 
  

   of 
  the 
  pocket 
  there 
  is 
  an 
  opening 
  in 
  which 
  the 
  vertical 
  waste-pipe 
  fits. 
  

   This 
  pii)e 
  is 
  brass, 
  ^ 
  inch 
  in 
  diameter 
  and 
  10 
  or 
  11 
  inches 
  loiig; 
  the 
  top 
  

   of 
  the 
  ])ipe 
  is 
  7 
  inches 
  above 
  the 
  bottom 
  of 
  the 
  table. 
  The 
  waste-pipes 
  

   from 
  the 
  difierent 
  boxes 
  discharge 
  into 
  a 
  trough 
  which 
  carries 
  the 
  water 
  

   from 
  the 
  building. 
  

  

  A 
  particularly 
  important 
  part, 
  and 
  the 
  one 
  which 
  gives 
  the 
  name 
  

   "tidal 
  box" 
  to 
  the 
  ai)paratus, 
  is 
  used 
  in 
  conjunction 
  with 
  the 
  waste- 
  

   l)ipe. 
  This 
  is 
  a 
  brass 
  siphon-cap, 
  which 
  firs 
  over 
  the 
  upper 
  end 
  of 
  the 
  

   waste 
  pipe. 
  The 
  cap 
  is 
  a 
  tube, 
  closed 
  at 
  the 
  top, 
  9 
  inches 
  long 
  and 
  1 
  J 
  

   inches 
  in 
  diameter. 
  It 
  is 
  kept 
  at 
  any 
  desired 
  height 
  on 
  the 
  waste-pipe 
  

   by 
  wire 
  springs 
  in 
  the 
  cap 
  or 
  by 
  other 
  means. 
  

  

  By 
  virtue 
  of 
  the 
  siphon 
  attachment 
  the 
  water 
  in 
  each 
  box 
  rises 
  to 
  

   the 
  height 
  of 
  the 
  top 
  of 
  the 
  waste-pipe 
  and 
  begins 
  to 
  run 
  over. 
  This 
  

   partly 
  exluxusts 
  the 
  air 
  in 
  the 
  cap, 
  more 
  water 
  rushes 
  in, 
  and 
  the 
  pipe 
  

   becomes 
  filled 
  witli 
  water; 
  then 
  the 
  siphon 
  begins 
  to 
  act 
  and 
  takes 
  off 
  

   the 
  water 
  to 
  a 
  level 
  of 
  the 
  bottom 
  of 
  the 
  siphon-cap. 
  Usually 
  the 
  cap 
  

   is 
  pushed 
  about 
  half 
  down 
  the 
  waste-tube, 
  although 
  the 
  bright 
  of 
  the 
  

   water 
  in 
  the 
  box 
  after 
  the 
  discharge 
  ot 
  the 
  siphon 
  is 
  regulated 
  by 
  the 
  

   manner 
  in 
  which 
  the 
  eggs 
  are 
  working. 
  About 
  7 
  minutes 
  are 
  required 
  

   for 
  the 
  water 
  to 
  be 
  drawn 
  down 
  and 
  the 
  box 
  to 
  again 
  fill, 
  and 
  approxi- 
  

   mati'ly 
  two 
  fifths 
  of 
  the 
  water 
  is 
  taken 
  off 
  at 
  each 
  discharge. 
  By 
  this 
  

   arrangemeiht 
  the 
  water 
  in 
  the 
  boxes 
  is 
  constantly 
  rising 
  and 
  falling 
  

   automatically; 
  the 
  movements 
  of 
  the 
  waves 
  are 
  thus 
  simulated, 
  the 
  

   eggs 
  are 
  kept 
  in 
  constant 
  circulation, 
  and 
  fresh 
  water 
  is 
  continually 
  

   entering 
  the 
  boxes. 
  

  

  The 
  Chester 
  box 
  was 
  generally 
  used 
  in 
  cod-culture 
  up 
  to 
  a 
  com- 
  

   paratively 
  recent 
  date, 
  and 
  is 
  still 
  occasionally 
  employed 
  in 
  marine 
  

   fish 
  cultural 
  operations. 
  The 
  general 
  object 
  of 
  its 
  construction 
  is 
  the 
  

   production 
  of 
  an 
  automatic 
  rise 
  and 
  fall 
  of 
  water, 
  as 
  in 
  the 
  McDonald 
  

   box, 
  although 
  it 
  differs 
  from 
  the 
  latter 
  in 
  some 
  essential 
  particulars. 
  

   It 
  consists 
  of 
  a 
  box 
  of 
  variable 
  dimensions 
  in 
  which 
  jars 
  are 
  placed 
  for 
  

   the 
  reception 
  of 
  the 
  eggs. 
  A 
  convenient 
  size 
  of 
  box 
  is 
  7| 
  feet 
  long, 
  2 
  

   feet 
  wide, 
  and 
  2^ 
  feet 
  deep. 
  From 
  4 
  to 
  8 
  large 
  glass 
  jars 
  are 
  arranged 
  

   on 
  wooden 
  supports 
  7 
  or 
  8 
  inches 
  above 
  the 
  bottom 
  of 
  the 
  trough. 
  

   Smaller 
  boxes, 
  to 
  accommodate 
  only 
  2 
  or 
  4 
  jars, 
  are 
  also 
  used. 
  The 
  jars 
  

   are 
  about 
  9 
  inches 
  in 
  diameter 
  and 
  are 
  of 
  two 
  heights 
  — 
  9 
  inches 
  and 
  17 
  

   or 
  18 
  inches; 
  they 
  have 
  straight 
  sides 
  and 
  a 
  flat 
  bottom 
  with 
  a 
  central 
  

   half 
  inch 
  hole. 
  

  

  The 
  jar 
  is 
  placed 
  in 
  the 
  box 
  in 
  an 
  inverted 
  position, 
  with 
  its 
  bottom 
  

   above 
  the 
  level 
  of 
  the 
  top 
  of 
  the 
  trough. 
  The 
  sea 
  water 
  supplying 
  the 
  

   trough 
  enters 
  the 
  compartment 
  at 
  one 
  end 
  of 
  the 
  trough 
  and 
  escapes 
  

  

  