﻿ATLANTA 
  EXPOSITION. 
  155 
  

  

  was 
  often 
  as 
  low 
  as 
  GO 
  pounds 
  and 
  sometimes 
  went 
  as 
  liigli 
  as 
  125 
  

   pounds. 
  

  

  The 
  salt 
  water 
  was 
  forced 
  from 
  the 
  large 
  reservoir 
  below 
  the 
  floor, 
  by 
  

   means 
  of 
  the 
  pumps, 
  into 
  the 
  distributing 
  tank 
  located 
  in 
  the 
  south- 
  

   west 
  tower 
  of 
  the 
  main 
  building 
  25 
  feet 
  above 
  the 
  aquaria, 
  from 
  which 
  

   point 
  it 
  was 
  distributed 
  by 
  gravity 
  through 
  asphalt-lined 
  iron 
  piping 
  

   fitted 
  with 
  ^-inch 
  hard-rubber 
  jet 
  cocks. 
  The 
  water 
  was 
  fed 
  into 
  the 
  

   aquaria 
  through 
  ^-inch 
  glass 
  nozzles 
  attached 
  to 
  rubber 
  hose 
  leading 
  

   from 
  the 
  rubber 
  cocks, 
  which 
  delivered 
  it 
  at 
  the 
  surface 
  and 
  forced 
  air 
  

   in 
  with 
  it 
  In 
  additiou 
  to 
  the 
  surface 
  sui)plies, 
  each 
  aquarium 
  was 
  

   arranged 
  so 
  that 
  water 
  could 
  be 
  introduced 
  at 
  the 
  bottom 
  with 
  i-inch 
  

   hose. 
  

  

  The 
  overflow 
  was 
  the 
  same 
  as 
  on 
  the 
  fresh-water 
  side, 
  except 
  that 
  it 
  

   emptied 
  into 
  a 
  filter 
  box 
  connected 
  with 
  the 
  reservoir 
  tank, 
  and 
  was 
  

   thus 
  filtered 
  over 
  and 
  over 
  again. 
  

  

  The 
  filter 
  was 
  a 
  pine 
  box 
  7 
  feet 
  G 
  inches 
  long, 
  '> 
  feet 
  10 
  inches 
  wide, 
  

   and 
  IG 
  inches 
  deep, 
  filled 
  with 
  gravel 
  of 
  difterent 
  sizes, 
  varying 
  from 
  

   2 
  inches 
  to 
  J 
  inch 
  in 
  diameter, 
  laid 
  in 
  courses, 
  and 
  covered 
  with 
  2 
  inches 
  

   of 
  clean 
  sand. 
  The 
  capacity 
  of 
  this 
  filter 
  was 
  1,400 
  gallons 
  per 
  hour. 
  

  

  HEATER. 
  

  

  In 
  November, 
  finding 
  that 
  the 
  temperature 
  of 
  the 
  water 
  was 
  getting 
  

   too 
  low 
  for 
  the 
  salt-water 
  fishes 
  from 
  the 
  Gulf, 
  a 
  heater 
  was 
  made 
  for 
  

   regulating 
  it. 
  This 
  was 
  8 
  feet 
  long 
  and 
  made 
  of 
  2-inch 
  galvanized-iron 
  

   pipe, 
  arranged 
  like 
  the 
  ordinary 
  returu-beud 
  steam 
  heater. 
  Under 
  each 
  

   section 
  of 
  the 
  pipe 
  IG 
  gas 
  jets 
  were 
  placed, 
  and 
  the 
  entire 
  apparatus 
  

   was 
  encased 
  in 
  a 
  steel 
  box. 
  The 
  heater 
  was 
  placed 
  in 
  the 
  tower 
  and 
  so 
  

   connected 
  that 
  all 
  of 
  the 
  salt 
  water 
  could 
  be 
  passed 
  through 
  it 
  before 
  

   entering 
  the 
  supply 
  tank. 
  By 
  this 
  means 
  there 
  was 
  no 
  difficulty 
  in 
  

   keeping 
  the 
  water 
  at 
  an 
  even 
  temperature 
  of 
  from 
  00° 
  to 
  G3^ 
  when 
  the 
  

   air 
  temperature 
  was 
  below 
  tlie 
  freezing 
  point. 
  

  

  AIR 
  CIRCULATION. 
  

  

  In 
  order 
  to 
  provide 
  the 
  necessary 
  amount 
  of 
  air 
  to 
  the 
  aquarium 
  a 
  

   vertical 
  hydraulic 
  air-pump 
  or 
  compressor, 
  of 
  the 
  Bishop 
  & 
  Babcock 
  

   pattern, 
  was 
  erected 
  between 
  two 
  of 
  the 
  aquaria 
  on 
  the 
  salt-water 
  side. 
  

   The 
  water-power 
  cylinder 
  of 
  this 
  pump 
  is 
  4i 
  inches 
  in 
  diameter, 
  the 
  

   air 
  cylinder 
  (situated 
  above 
  the 
  water 
  cylinder) 
  G 
  inches, 
  and 
  the 
  stroke 
  

   8 
  inches. 
  The 
  pumps 
  deliver 
  the 
  air 
  into 
  the 
  galvanized-iron 
  cylinder, 
  

   where 
  a 
  pressure 
  of 
  about 
  7 
  pounds 
  per 
  square 
  inch 
  is 
  maintained, 
  and 
  

   from 
  there 
  it 
  is 
  fed 
  through 
  a 
  |-inch 
  pipe 
  along 
  the 
  backs 
  of 
  the 
  

   aquaria. 
  At 
  the 
  back 
  of 
  each 
  one 
  the 
  pipe 
  is 
  connected 
  with 
  rubber 
  

   tubing, 
  which 
  passes 
  down 
  the 
  back 
  to 
  the 
  bottom 
  of 
  the 
  tank. 
  Attlie 
  

   end 
  of 
  the 
  tubing 
  is 
  a 
  hard-rubber 
  cylinder 
  into 
  which 
  wooden 
  liberators 
  

   are 
  introduced 
  for 
  forcing 
  the 
  air 
  into 
  the 
  water 
  in 
  minute 
  globules. 
  

   The 
  air 
  and 
  water 
  circulating 
  plants 
  were 
  so 
  arranged 
  as 
  to 
  be 
  entirely 
  

   indei)endent 
  of 
  each 
  other, 
  so 
  that 
  in 
  case 
  of 
  the 
  water 
  supply 
  being 
  

   cut 
  off 
  it 
  was 
  possible 
  to 
  maintain 
  the 
  air 
  circulation. 
  

  

  