﻿MANUAL 
  OF 
  FISH-CULTURE. 
  203 
  

  

  feet; 
  width, 
  3 
  feet 
  8 
  inches; 
  depth, 
  11 
  inches. 
  The 
  table 
  or 
  trough 
  is 
  

   constructed 
  of 
  2-inch 
  lumber 
  and 
  raised 
  to 
  a 
  convenient 
  height 
  by 
  

   short, 
  stout 
  legs. 
  The 
  table 
  is 
  divided 
  into 
  9 
  water 
  tight 
  compart- 
  

   ments 
  by 
  means 
  of 
  crosswise 
  partitions 
  of 
  1^-inch 
  plank. 
  

  

  At 
  Woods 
  Hole 
  the 
  dimensions 
  of 
  the 
  troughs 
  containing 
  12 
  boxes 
  

   are 
  as 
  follows: 
  Length 
  over 
  all, 
  13 
  feet; 
  width, 
  2 
  feet 
  7 
  inches; 
  depth, 
  

   12 
  inches. 
  The 
  plank 
  is 
  li 
  inches 
  thick. 
  The 
  bottom 
  of 
  the 
  trough 
  is 
  

   2^ 
  feet 
  above 
  the 
  floor. 
  The 
  compartments 
  are 
  separated 
  by 
  1^-inch 
  

   partitions 
  and 
  are 
  22 
  inches 
  long, 
  12 
  inches 
  wide, 
  and 
  10^ 
  or 
  11 
  

   inches 
  deep. 
  

  

  Two 
  inches 
  from 
  each 
  end 
  of 
  each 
  compartment 
  there 
  is 
  a 
  1-inch 
  

   wood 
  partition. 
  The 
  partition 
  d 
  at 
  the 
  supply 
  or 
  ui)per 
  end 
  of 
  the 
  

   compartment 
  extends 
  with 
  its 
  middle 
  portion 
  to 
  the 
  bottom 
  of 
  the 
  

   trough, 
  while 
  the 
  two 
  sides 
  extend 
  only 
  to 
  within 
  li 
  inches 
  of 
  the 
  bot- 
  

   tom. 
  The 
  partition 
  e, 
  at 
  the 
  discharge 
  or 
  lower 
  end 
  of 
  the 
  compart- 
  

   ment, 
  extends 
  its 
  full 
  length 
  to 
  within 
  IJ 
  inches 
  of 
  the 
  bottom 
  of 
  the 
  

   trough. 
  Between 
  the 
  two 
  partitions 
  d 
  and 
  e 
  in 
  each 
  comjiartment 
  there 
  

   is 
  snugly 
  fitted 
  a 
  movable 
  box 
  in 
  whi(;h 
  the 
  eggs 
  are 
  placed. 
  This 
  

   box, 
  which 
  is 
  constructed 
  of 
  ^-inch 
  plank, 
  is 
  9 
  to 
  9^ 
  inrlies 
  dee[) 
  in 
  the 
  

   center, 
  but 
  only 
  8 
  inches 
  deep 
  at 
  the 
  corners, 
  the 
  bottom 
  sloping 
  

   upward 
  toward 
  the 
  sides 
  and 
  ends 
  of 
  the 
  box 
  and 
  being 
  covered 
  with 
  

   linen 
  scrim. 
  A 
  wooden 
  strip 
  at 
  the 
  bottom, 
  ^ 
  inch 
  thick 
  and 
  conform- 
  

   ing 
  to 
  the 
  shape 
  of 
  the 
  bottom 
  of 
  the 
  box, 
  extends 
  the 
  length 
  of 
  the 
  box. 
  

   The 
  box 
  rests 
  on 
  cleats 
  in 
  the 
  corners 
  of 
  the 
  compartments 
  which 
  keep 
  

   the 
  center 
  of 
  the 
  box 
  li 
  inches 
  above 
  the 
  bottom 
  of 
  the 
  trough. 
  

  

  The 
  space 
  at 
  the 
  supply 
  end 
  of 
  each 
  compartment 
  is 
  divided 
  into 
  

   three 
  pockets 
  by 
  1-inch 
  wood 
  partitions. 
  The 
  middle 
  pocket 
  connects 
  

   with 
  the 
  main 
  compartment 
  by 
  means 
  of 
  a 
  small 
  hole 
  {-^^ 
  to 
  -^ 
  inch) 
  

   through 
  the 
  center 
  of 
  the 
  partition 
  and 
  end 
  of 
  the 
  box 
  immediately 
  

   above 
  the 
  lengthwise 
  strip, 
  and 
  the 
  two 
  lateral 
  pockets 
  connect 
  by 
  a 
  

   space 
  at 
  the 
  bottom 
  Avith 
  the 
  main 
  compartment. 
  

  

  At 
  Woods 
  Hole 
  the 
  water 
  used 
  in 
  hatching 
  is 
  pumped 
  from 
  the 
  

   harbor 
  to 
  two 
  tanks 
  of 
  about 
  18,000 
  gallons 
  joint 
  capacity. 
  The 
  water 
  

   is 
  led 
  to 
  the 
  hatching-room 
  through 
  a 
  4 
  inch 
  wooden 
  pipe 
  and 
  is 
  sup- 
  

   plied 
  to 
  the 
  hatching 
  apparatus 
  through 
  a 
  2|-inch 
  hard-rubber 
  pipe 
  

   which 
  branches 
  from 
  the 
  main 
  pipe 
  and 
  runs 
  directly 
  over 
  each 
  row 
  of 
  

   tables. 
  At 
  Gloucester 
  the 
  main 
  supply-pipe 
  is 
  of 
  hard 
  rubber, 
  3 
  inches 
  

   in 
  diameter; 
  this 
  leads 
  from 
  a 
  tank 
  of 
  15,00(> 
  gallons 
  ca^pacity, 
  the 
  

   bottom 
  of 
  which 
  is 
  about 
  6 
  feet 
  above 
  the 
  level 
  of 
  the 
  troughs. 
  A 
  small 
  

   soft-rubber 
  tube, 
  provided 
  with 
  a 
  rubber 
  pet-cock, 
  carries 
  the 
  water 
  to 
  

   the 
  middle 
  pocket 
  at 
  the 
  back 
  of 
  each 
  box. 
  As 
  the 
  pocket 
  is 
  always 
  

   full 
  of 
  water 
  when 
  the 
  boxes 
  are 
  in 
  oi^eration, 
  a 
  considerable 
  amount 
  

   of 
  water 
  goes 
  through 
  the 
  small 
  hole 
  with 
  mucb 
  force, 
  creating 
  a 
  strong 
  

   current 
  in 
  the 
  box 
  and 
  keeping 
  the 
  eggs 
  in 
  constant 
  rotary 
  motion. 
  

   This 
  current 
  is 
  one 
  of 
  the 
  principal 
  features 
  of 
  the 
  appara^tus. 
  

  

  Much 
  more 
  water 
  enters 
  the 
  middle 
  pocket 
  than 
  can 
  pass 
  through 
  

   the 
  smal'l 
  hole 
  into 
  the 
  box, 
  and 
  the 
  surplus 
  flows 
  over 
  tke 
  sides 
  and 
  

  

  