﻿MANUAL 
  OF 
  FISH-CULTURE. 
  241 
  

  

  piping, 
  which 
  runs 
  from 
  the 
  pump 
  to 
  the 
  pressure-tank, 
  thence 
  along 
  

   the 
  sides 
  of 
  the 
  refrigerator 
  to 
  the 
  transportation-tanks, 
  whence 
  it 
  flows 
  

   by 
  gravity 
  to 
  a 
  tank 
  below 
  the 
  floor. 
  From 
  here 
  it 
  is 
  pumped 
  into 
  the 
  

   supply 
  tank 
  for 
  redistribution. 
  

  

  In 
  order 
  to 
  provide 
  sufficient 
  air 
  circulation, 
  the 
  air 
  is 
  driven 
  by 
  a 
  

   pump 
  to 
  a 
  30-gallon 
  reservoir 
  in 
  the 
  top 
  of 
  the 
  car 
  over 
  the 
  boiler-room, 
  

   from 
  which 
  it 
  is 
  taken 
  to 
  the 
  transportation-tanks 
  or 
  cans 
  through 
  two 
  

   lines 
  of 
  iron 
  piping 
  running 
  along 
  the 
  sides 
  and 
  top 
  of 
  the 
  car. 
  One 
  

   l)et-cock 
  is 
  placed 
  in 
  the 
  pipe 
  for 
  each 
  tank 
  to 
  be 
  supplied 
  with 
  air, 
  

   which 
  comes 
  to 
  i 
  t 
  through 
  a 
  hole 
  :j\ 
  inch 
  in 
  diameter. 
  From 
  the 
  pet-cock 
  

   the 
  air 
  is 
  carried 
  into 
  the 
  tank 
  with 
  rubber 
  hose 
  and 
  released 
  in 
  the 
  

   water 
  through 
  liberators 
  made 
  of 
  American 
  linden, 
  placed 
  in 
  hard- 
  

   rubber 
  holders. 
  

  

  Before 
  the 
  present 
  system 
  of 
  water 
  circulation 
  was 
  adopted 
  the 
  water 
  

   was 
  taken 
  from 
  four 
  40- 
  gallon 
  tanks 
  located 
  in 
  the 
  bottom 
  of 
  the 
  refrig- 
  

   erator 
  compartments, 
  pumped 
  into 
  four 
  60-gallon 
  supply-tanks, 
  from 
  

   which 
  it 
  flowed 
  through 
  the 
  transportation-boxes 
  and 
  was 
  returned 
  

   thence 
  to 
  the 
  lower 
  tanks. 
  The 
  water 
  supply 
  was 
  at 
  first 
  connected 
  with 
  

   a 
  rotarj^ 
  hand-pump, 
  and 
  afterwards 
  an 
  arrangement 
  was 
  adopted 
  to 
  fur- 
  

   nish 
  power 
  for 
  the 
  pump 
  and 
  an 
  air-blower, 
  by 
  means 
  of 
  a 
  friction 
  wheel 
  

   placed 
  on 
  the 
  truck 
  at 
  one 
  end 
  of 
  the 
  car. 
  This 
  wheel 
  was 
  attached 
  

   near 
  one 
  end 
  to 
  the 
  top 
  of 
  the 
  truck, 
  so 
  that 
  it 
  rested 
  on 
  the 
  tread 
  of 
  

   the 
  car 
  wheel 
  and 
  was 
  held 
  there 
  by 
  two 
  spiral 
  springs. 
  When 
  not 
  in 
  

   use, 
  it 
  could 
  be 
  elevated 
  above 
  the 
  car 
  wheel 
  by 
  a 
  lever 
  operated 
  from 
  

   inside 
  the 
  car. 
  Power 
  was 
  transmitted 
  from 
  the 
  friction 
  wheel 
  by 
  means 
  

   of 
  a 
  countershaft 
  and 
  rubber 
  belting. 
  The 
  friction 
  wheel 
  gave 
  a 
  great 
  

   deal 
  of 
  trouble, 
  however, 
  as 
  it 
  was 
  impossible 
  to 
  make 
  it 
  strong 
  enough 
  

   to 
  stand 
  the 
  wear 
  to 
  which 
  it 
  was 
  subjected. 
  As 
  the 
  action 
  of 
  the 
  truck 
  

   springs, 
  while 
  the 
  car 
  was 
  in 
  motion, 
  moved 
  the 
  truck 
  frame 
  up 
  and 
  

   down 
  — 
  sometimes 
  3 
  to 
  5 
  inches 
  — 
  the 
  friction 
  wheel 
  would 
  be 
  jolted 
  out 
  

   of 
  position, 
  and 
  so 
  uncertain 
  was 
  its 
  operation 
  that 
  it 
  could 
  not 
  be 
  relied 
  

   upon 
  and 
  the 
  pump 
  and 
  blower 
  had 
  to 
  be 
  worked 
  by 
  hand. 
  

  

  This 
  car 
  is 
  also 
  fitted 
  up 
  with 
  a 
  hatching 
  outfit, 
  consisting 
  of 
  eight 
  

   lead-lined 
  boxes 
  about 
  6 
  inches 
  high, 
  which 
  may 
  be 
  placed 
  on 
  top 
  of 
  

   the 
  refrigerators 
  and 
  made 
  to 
  fit 
  in 
  place 
  of 
  the 
  lids, 
  which 
  can 
  be 
  

   removed. 
  These 
  boxes 
  each 
  hold 
  six 
  McDonald 
  jars. 
  An 
  aquarium, 
  

   specially 
  made 
  for 
  the 
  work, 
  is 
  placed 
  in 
  the 
  center 
  of 
  each 
  box, 
  with 
  

   three 
  jars 
  on 
  each 
  side 
  of 
  it. 
  The 
  jars 
  and 
  aquarium 
  are 
  securely 
  

   wedged 
  in 
  the 
  box, 
  so 
  that 
  they 
  can 
  not 
  move. 
  The 
  supply 
  of 
  water 
  for 
  

   the 
  jars 
  comes 
  from 
  the 
  supply 
  i)ipes 
  in 
  the 
  refrigerator 
  comi)artments, 
  

   the 
  pipe 
  coming 
  up 
  through 
  the 
  top 
  of 
  the 
  refrigerator 
  near 
  the 
  center, 
  

   then 
  branching 
  out 
  on 
  each 
  side 
  with 
  pet-cocks 
  in 
  it, 
  to 
  which 
  is 
  

   attached 
  the 
  rubber 
  tubing 
  to 
  supply 
  the 
  jars. 
  The 
  overflow 
  is 
  through 
  

   a 
  pipe 
  leading 
  out 
  of 
  the 
  bottom 
  of 
  the 
  boxes 
  into 
  the 
  tank 
  under 
  the 
  

   car. 
  

  

  Fry 
  are 
  carried 
  in 
  cans, 
  and 
  yearlings 
  and 
  adults 
  in 
  the 
  transporta- 
  

   tion 
  tanks. 
  Great 
  care 
  is 
  taken 
  not 
  (o 
  make 
  a 
  sudden 
  change 
  in 
  the 
  

  

  F. 
  C. 
  R. 
  1897 
  16 
  

  

  