﻿MANUAL 
  OF 
  FISH-CULTURE. 
  127 
  

  

  house 
  if 
  desired. 
  The 
  connection 
  is 
  made 
  by 
  a 
  thin 
  brass 
  nipple 
  with 
  

   the 
  same 
  interior 
  diameter 
  as 
  the 
  jjiece 
  of 
  rubber 
  tube 
  to 
  be 
  joined 
  by 
  

   slipping 
  it 
  into 
  the 
  longer 
  piece 
  and 
  lashing 
  it 
  on 
  the 
  outside 
  with 
  twine, 
  

   leaving 
  about 
  three-quarters 
  of 
  an 
  inch 
  outside 
  to 
  slip 
  into 
  the 
  shorter 
  

   piece 
  after 
  the 
  siphon 
  is 
  started. 
  The 
  other 
  end 
  of 
  the 
  long 
  tube 
  is 
  

   connected 
  with 
  a 
  like 
  piece 
  of 
  brass 
  tubing, 
  bent 
  to 
  a 
  quarter 
  circle 
  to 
  

   prevent 
  the 
  rubber 
  tubing 
  from 
  kinking, 
  to 
  and 
  through 
  the 
  center 
  of 
  

   a 
  wooden 
  float 
  some 
  12 
  inches 
  in 
  diameter 
  and 
  1 
  or 
  2 
  inches 
  thick. 
  

   This 
  is 
  placed 
  in 
  a 
  tub 
  or 
  large 
  pail 
  ; 
  the 
  short 
  siphon 
  is 
  started 
  and 
  

   connected 
  as 
  above 
  described, 
  and 
  the 
  long 
  siphon 
  is 
  in 
  working 
  order. 
  

   The 
  water 
  runs 
  over 
  the 
  rim 
  of 
  the 
  tub 
  into 
  the 
  sluice, 
  over 
  which 
  it 
  is 
  

   placed, 
  and 
  the 
  eggs 
  settle 
  to 
  the 
  bottom. 
  A 
  whole 
  hatchery 
  can 
  be 
  

   operated 
  without 
  moving 
  the 
  tub, 
  although 
  it 
  is 
  better 
  to 
  raise 
  it 
  5 
  or 
  G 
  

   feet 
  from 
  the 
  floor 
  for 
  the 
  upper 
  rows 
  of 
  the 
  Jars, 
  as 
  the 
  suction 
  

   otherwise 
  becomes 
  a 
  little 
  too 
  strong 
  and 
  liable 
  to 
  injure 
  the 
  good 
  eggs 
  

   Avhen 
  iiassing 
  too 
  rapidly 
  through 
  the 
  tube. 
  

  

  For 
  convenience 
  and 
  for 
  economy 
  of 
  space 
  and 
  water, 
  the 
  hatching 
  

   jars 
  are 
  arranged 
  in 
  tiers, 
  constituting 
  what 
  is 
  known 
  as 
  a 
  "battery." 
  

   The 
  structure 
  of 
  a 
  battery, 
  with 
  its 
  complicated 
  system 
  of 
  supply 
  

   and 
  waste 
  troughs 
  and 
  with 
  the 
  jars 
  and 
  their 
  attachments, 
  is 
  rather 
  

   difficult 
  to 
  describe 
  clearly, 
  but 
  may 
  be 
  understood 
  by 
  reference 
  to 
  

   plate 
  35, 
  at 
  the 
  end 
  of 
  the 
  volume. 
  

  

  Each 
  battery 
  is 
  divided 
  into 
  two 
  sections, 
  which 
  have 
  four 
  rows 
  of 
  

   jars 
  on 
  each 
  side, 
  setting 
  on 
  shelves 
  3 
  feet 
  apart. 
  The 
  water 
  is 
  admitted 
  

   through 
  an 
  iron 
  pipe 
  to 
  the 
  uppermost 
  cross-tank; 
  from 
  there 
  it 
  runs 
  

   into 
  the 
  upjjermost 
  supply-trough, 
  which, 
  like 
  all 
  the 
  others, 
  is 
  13 
  inches 
  

   wide 
  and 
  9 
  inches 
  deei>, 
  inside 
  measurements. 
  The 
  iron 
  pipe 
  is 
  provided 
  

   with 
  a 
  ball-cock, 
  regulating 
  automatically 
  the 
  supi>ly 
  of 
  water. 
  The 
  

   supply-troughs 
  are 
  from 
  22 
  to 
  34 
  feet 
  long, 
  the 
  uj^per 
  ones 
  being 
  the 
  

   shortest 
  and 
  the 
  lower 
  the 
  longest. 
  The 
  first 
  supply-trough 
  has 
  a 
  row 
  

   of 
  brass 
  cocks 
  on 
  either 
  side 
  taking 
  the 
  water 
  1 
  inch 
  from 
  the 
  bottom. 
  

   A 
  half-inch 
  rubber 
  tube, 
  G 
  inches 
  long 
  and 
  forming 
  when 
  adjusted 
  a 
  

   quarter 
  circle, 
  is 
  slipped 
  over 
  the 
  outer 
  end 
  of 
  the 
  cock 
  and 
  the 
  upper 
  

   end 
  of 
  the 
  iron 
  tube, 
  which 
  is 
  inserted 
  in 
  the 
  jar. 
  The 
  water 
  flows 
  from 
  

   this 
  upper 
  supply 
  trough, 
  which 
  may 
  be 
  called 
  i^o. 
  1, 
  in 
  section 
  No. 
  1, 
  

   through 
  the 
  cock, 
  rubber 
  tube, 
  iron 
  tube, 
  and 
  jar, 
  from 
  which 
  it 
  is 
  dis- 
  

   charged 
  into 
  what 
  may 
  be 
  called 
  waste-trough 
  Xo. 
  1, 
  which 
  is 
  directly 
  

   below 
  supply-trough 
  No. 
  1. 
  This 
  discharges 
  its 
  water 
  into 
  a 
  cross-tank, 
  

   the 
  second 
  from 
  the 
  top, 
  which 
  carries 
  the 
  water 
  across 
  to 
  supply 
  -trough 
  

   No. 
  2, 
  which 
  is 
  in 
  section 
  No. 
  2. 
  This 
  supplies 
  the 
  second 
  of 
  the 
  eight 
  

   rows 
  of 
  jars, 
  through 
  which 
  all 
  the 
  water 
  passes, 
  and 
  after 
  passing 
  

   through 
  the 
  jars, 
  as 
  before 
  described, 
  it 
  empties 
  into 
  waste-trough 
  No. 
  2, 
  in 
  

   section 
  No. 
  2, 
  which 
  carries 
  it 
  to 
  cross-tank 
  No. 
  3, 
  which 
  in 
  turn 
  carries 
  

   it 
  across 
  and 
  delivers 
  it 
  to 
  supply-trough 
  No. 
  3, 
  which 
  is 
  in 
  section 
  No. 
  

   1. 
  Thus 
  the 
  water 
  goes 
  back 
  and 
  forth 
  from 
  one 
  section 
  to 
  the 
  other, 
  

   dropping 
  a 
  step 
  at 
  each 
  passage, 
  until 
  it 
  finally 
  enters 
  the 
  fry- 
  collecting 
  

   tank 
  on 
  the 
  floor, 
  which 
  is 
  3J 
  feet 
  wide, 
  9 
  feet 
  long, 
  and 
  2 
  feet 
  deep. 
  

  

  