﻿50 
  

  

  REPORT 
  OF 
  COMMISSIONER 
  OP 
  FISH 
  AND 
  FISHERIES. 
  [48] 
  

  

  and 
  make 
  the 
  necessary 
  alteration 
  in 
  the 
  bunkers 
  and 
  deck-house, 
  as 
  

   indicated 
  in 
  the 
  drawings 
  already 
  submitted. 
  

  

  Fig. 
  3. 
  

  

  MARINE 
  GOVERNORS. 
  

  

  The 
  Svedberg 
  governors 
  continue 
  to 
  work 
  adm 
  irably. 
  Stormy 
  weather 
  

   on 
  the 
  7th, 
  loth, 
  and 
  16th 
  of 
  January, 
  the 
  12th 
  of 
  February, 
  the 
  9th 
  

   and 
  31st 
  of 
  March 
  compelled 
  the 
  use 
  of 
  the 
  governors, 
  on 
  all 
  of 
  which 
  

   occasions 
  they 
  worked 
  very 
  well. 
  I 
  consider 
  them 
  indispensable. 
  Ex- 
  

   perience 
  has 
  demonstrated 
  that 
  the 
  relative 
  direction 
  and 
  force 
  of 
  the 
  

   gale 
  requires 
  a 
  different 
  height 
  of 
  mercury 
  in 
  the 
  cups; 
  I 
  have 
  therefore 
  

   tapped 
  iron 
  cocks 
  into 
  the 
  bottoms 
  of 
  the 
  mercury-cups 
  for 
  diminishing 
  

   the 
  height 
  of 
  mercury. 
  

  

  DREDGING 
  ENGINE. 
  

  

  This 
  engine 
  continues 
  to 
  do 
  its 
  work 
  well, 
  giving 
  but 
  little 
  trouble. 
  

   We 
  have 
  reset 
  the 
  steam-valves, 
  and 
  the 
  engine 
  now 
  runs 
  more 
  smoothly 
  

   than 
  formerly. 
  On 
  one 
  occasion 
  the 
  cast-iron 
  chamber 
  of 
  the 
  throttle- 
  

   valve 
  was 
  broken, 
  probably 
  from 
  water 
  in 
  the 
  pipe; 
  the 
  engine 
  was 
  not 
  

   in 
  motion 
  at 
  the 
  time. 
  To 
  prevent 
  detaining 
  the 
  ship 
  in 
  port 
  we 
  sub- 
  

   stituted 
  a 
  smaller 
  valve, 
  wfiich 
  was 
  used 
  during 
  one 
  dredging 
  voyage 
  

   in 
  the 
  Gulf 
  Stream, 
  and 
  when 
  the 
  ship 
  returned 
  to 
  port 
  we 
  put 
  in 
  a 
  

   duplicate 
  of 
  the 
  original 
  valve. 
  We 
  have 
  overhauled 
  this 
  engine 
  dur- 
  

   ing 
  the 
  year, 
  adjusted 
  the 
  bearings, 
  lined 
  up 
  the 
  roller-guide, 
  &c. 
  3 
  and 
  

   have, 
  polished 
  some 
  of 
  the 
  rough, 
  unhnished 
  parts. 
  

  

  