﻿162 
  REPOET 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  

  

  washer 
  was 
  sunk 
  in 
  the 
  frame, 
  and 
  the 
  coupHng- 
  revolved 
  on 
  this. 
  

   When 
  the 
  fan 
  was 
  in 
  position, 
  the 
  blades 
  were 
  about 
  6 
  inches 
  from 
  the 
  

   bottom 
  and 
  about 
  the 
  same 
  distance 
  from 
  the 
  sides 
  of 
  the 
  bag. 
  An 
  

   8-inoh 
  galvanized 
  sheave, 
  L, 
  was 
  put 
  on 
  the 
  upper 
  end 
  of 
  the 
  shaft 
  and 
  

   fastened 
  with 
  a 
  set 
  screw. 
  A 
  belt 
  from 
  the 
  main 
  power 
  shaft, 
  E, 
  on 
  

   one 
  of 
  the 
  pontoons, 
  to 
  this 
  wheel 
  transmitted 
  the 
  power 
  for 
  revolving 
  

   the 
  shaft. 
  It 
  was 
  found 
  that 
  the 
  strength 
  of 
  the 
  current 
  could 
  easily 
  

   be 
  controlled 
  by 
  changing 
  the 
  angle 
  of 
  the 
  blades. 
  

  

  The 
  power 
  for 
  rotating 
  the 
  fan 
  was 
  supplied 
  by 
  a 
  Fairbanks 
  & 
  Morse 
  

   gasoline 
  engine 
  of 
  2^ 
  horsepower, 
  which 
  was 
  placed 
  in 
  one 
  of 
  the 
  

   houses 
  of 
  the 
  boat 
  and 
  connected 
  by 
  a 
  belt 
  with 
  a 
  large 
  driving 
  wheel 
  

   on 
  the 
  main 
  power 
  shaft. 
  This 
  shaft 
  was 
  set 
  up 
  on 
  the 
  deck 
  of 
  one 
  

   pontoon 
  and 
  extended 
  the 
  length 
  of 
  the 
  well. 
  At 
  intervals 
  on 
  the 
  

   shaft 
  corresponding 
  to 
  the 
  positions 
  of 
  the 
  fans, 
  small 
  3i-inch 
  wheels 
  

   were 
  fastened 
  with 
  set 
  screws. 
  Each 
  of 
  these 
  wheels 
  was 
  connected 
  

   with 
  the 
  driving 
  wheel 
  of 
  the 
  fan 
  by 
  a 
  rope 
  belt. 
  

  

  The 
  most 
  troublesome 
  part 
  of 
  the 
  mechanism 
  was 
  the 
  belting. 
  All 
  

   the 
  machinery 
  except 
  the 
  engine 
  was 
  exposed 
  to 
  the 
  weather. 
  No 
  

   belting 
  was 
  found 
  that 
  would 
  stand 
  the 
  weather 
  and 
  not 
  stretch 
  and 
  

   shrink, 
  and 
  finally 
  a 
  loose-laid 
  1-inch 
  rope 
  called 
  "" 
  Russia 
  purse 
  line'" 
  

   was 
  used, 
  as 
  this 
  seemed 
  least 
  atf'ected 
  by 
  dampness. 
  The 
  annoj^ance 
  

   from 
  the 
  slacking 
  and 
  shrinking 
  was 
  overcome 
  in 
  two 
  ways. 
  The 
  

   belts 
  could 
  be 
  lengthened 
  or 
  shortened 
  several 
  inches 
  by 
  moving 
  the 
  

   sheave 
  up 
  or 
  down 
  on 
  the 
  shaft 
  of 
  the 
  fan; 
  when 
  this 
  was 
  not 
  suffi- 
  

   cient 
  they 
  were 
  run 
  over 
  spools 
  which 
  were 
  fastened 
  to 
  the 
  supporting 
  

   posts 
  and 
  which 
  acted 
  as 
  third 
  pulle3% 
  The 
  fans 
  revolved 
  at 
  the 
  rate 
  

   of 
  15 
  to 
  20 
  turns 
  per 
  minute, 
  and 
  produced 
  a 
  current 
  which 
  took 
  all 
  

   the 
  material 
  from 
  the 
  bottom, 
  but 
  still 
  allowed 
  comparatively 
  uniform 
  

   distribution 
  of 
  the 
  fry 
  in 
  the 
  upper 
  part 
  of 
  the 
  bag. 
  

  

  OBJECT 
  OF 
  THE 
  WORK. 
  

  

  The 
  chief 
  object 
  of 
  the 
  investigations 
  in 
  1001 
  was 
  not 
  to 
  see 
  how 
  

   large 
  a 
  number 
  of 
  lobsterlings 
  could 
  be 
  reared, 
  but 
  to 
  determine 
  how 
  

   large 
  a 
  percentage 
  could 
  be 
  carried 
  through 
  successfully 
  to 
  the 
  fourth 
  

   stage 
  by 
  means 
  of 
  stirring 
  the 
  water. 
  From 
  the 
  data 
  thus 
  secured 
  the 
  

   value 
  of 
  the 
  principle 
  could 
  be 
  judged 
  and 
  the 
  wisdom 
  of 
  its 
  applica- 
  

   tion 
  on 
  a 
  large 
  scale 
  determined. 
  Observations 
  were 
  also 
  continued 
  

   on 
  the 
  habits 
  of 
  the 
  fry 
  in 
  the 
  several 
  stages, 
  the 
  eflect 
  of 
  temperature 
  

   and 
  light, 
  food, 
  and 
  the 
  best 
  method 
  of 
  feeding. 
  

  

  Fourteen 
  experiments 
  were 
  made 
  in 
  all, 
  of 
  which 
  two 
  were 
  total 
  or 
  

   partial 
  failures 
  through 
  accidents 
  to 
  the 
  apparatus, 
  while 
  in 
  the 
  last 
  

   experiment 
  the 
  stirring 
  was 
  not 
  continued 
  after 
  the 
  fifth 
  day. 
  The 
  

   complete 
  data 
  of 
  the 
  experiments 
  are 
  given 
  in 
  Table 
  III. 
  Nearly 
  9,000 
  

   lobsterlings 
  were 
  obtained 
  and 
  either 
  released 
  in 
  the 
  adjacent 
  waters 
  

  

  