﻿[23] 
  

  

  REPORT 
  ON 
  THERMOMETERS. 
  

  

  207 
  

  

  capsizes 
  and 
  registers 
  the 
  temperature 
  by 
  breaking 
  the 
  column 
  of 
  

   mercury."* 
  

  

  BifJ 
  Sig- 
  2 
  Tin. 
  3. 
  

  

  Fig. 
  15. 
  — 
  The 
  Bailie-Tanner 
  deep-sea 
  thermometer 
  case. 
  

  

  The 
  time 
  consumed 
  by 
  the 
  descent 
  of 
  a 
  messenger 
  in 
  deep 
  water 
  is 
  

   saved 
  by 
  this 
  device, 
  and 
  the 
  distance 
  through 
  which 
  the 
  apparatus 
  

   must 
  pass 
  before 
  the 
  propeller 
  releases 
  the 
  wire 
  can 
  be 
  regulated 
  at 
  

   pleasure, 
  by 
  a 
  set 
  screw, 
  between 
  the 
  limits 
  of 
  3 
  and 
  10 
  fathoms. 
  

  

  The 
  Magnaghi 
  case, 
  invented 
  by 
  Commandante 
  Magnaghi, 
  of 
  the 
  

   Italian 
  navy, 
  and 
  sold 
  as 
  " 
  Negretti 
  and 
  Zambra's 
  patent 
  improved 
  

   frame 
  standard 
  deep-sea 
  thermometer," 
  was 
  found 
  to 
  be 
  not 
  well 
  adapted 
  

   for 
  use 
  on 
  a 
  sounding 
  wire, 
  and 
  was 
  therefore 
  not 
  often 
  used 
  in 
  the 
  work 
  

   of 
  the 
  Commission. 
  It 
  is 
  described 
  by 
  the 
  makers 
  as 
  follows: 
  

  

  " 
  The 
  apparatus 
  will 
  be 
  best 
  understood, 
  short 
  of 
  inspection, 
  by 
  ref- 
  

   erence 
  to 
  Pig. 
  16. 
  A 
  is 
  a 
  metallic 
  frame, 
  in 
  which 
  the 
  case 
  B, 
  contain- 
  

   ing 
  the 
  thermometer, 
  is 
  pivoted 
  upon 
  an 
  axis, 
  H, 
  but 
  not 
  balanced 
  upon 
  

   it. 
  C 
  is 
  a 
  screw-fan 
  attached 
  to 
  a 
  spindle, 
  one 
  end 
  of 
  which 
  works 
  in 
  

  

  * 
  Report 
  on 
  the 
  work 
  of 
  the 
  U. 
  S. 
  Fish 
  Commission 
  steamer 
  Fish 
  Hawk 
  for 
  the 
  year 
  

   ending 
  December 
  31, 
  1882, 
  and 
  on 
  the 
  construction 
  of 
  the 
  steamer 
  Albatross, 
  by 
  Lieut. 
  

   Z. 
  L. 
  Tanner, 
  U. 
  S. 
  N., 
  commanding. 
  (In 
  Report 
  of 
  the 
  Commissioner, 
  1882, 
  p. 
  11.) 
  

  

  