﻿384 
  On 
  a 
  new 
  Hygrometric 
  Method. 
  

  

  Table 
  III. 
  deals 
  further 
  with 
  ventilation. 
  A 
  wet 
  bulb 
  and 
  

   an 
  acid 
  bulb 
  were 
  mounted 
  at 
  opposite 
  ends 
  of 
  a 
  diameter 
  of 
  

   a 
  whirling 
  machine, 
  in 
  a 
  room 
  where 
  the 
  air 
  was 
  very 
  calm 
  

   and 
  of 
  even 
  temperature. 
  They 
  were 
  read 
  at 
  rest 
  and 
  again 
  

   after 
  2 
  minutes' 
  whirling 
  at 
  about 
  6 
  metres 
  per 
  sec. 
  The 
  

   result 
  shows 
  an 
  almost 
  perfect 
  immunity 
  towards 
  ventilation 
  

   except 
  in 
  the 
  cases 
  where 
  D 
  — 
  A 
  exceeds 
  + 
  3° 
  (see 
  Table 
  III.). 
  

   The 
  observers 
  who 
  kindly 
  assisted 
  were 
  kept 
  entirely 
  unaware 
  

   of 
  the 
  effect 
  to 
  be 
  looked 
  for. 
  

  

  Table 
  III. 
  

  

  D 
  = 
  Temperature 
  by 
  dry 
  bulb 
  thermometer. 
  

  

  W,= 
  ,, 
  wet 
  „ 
  before 
  1 
  , 
  . 
  v 
  

  

  * 
  " 
  " 
  y 
  whirling;. 
  

  

  W 
  3 
  = 
  „ 
  „ 
  „ 
  after 
  J 
  s 
  

  

  A-,= 
  „ 
  acid 
  ,, 
  before", 
  , 
  . 
  -.. 
  

  

  1 
  }■ 
  whirling. 
  

  

  A 
  3 
  = 
  „ 
  „ 
  „ 
  after 
  J 
  

  

  All 
  bulbs 
  09 
  centimetre 
  diameter. 
  

  

  Strengths 
  of 
  acid 
  adjusted 
  to 
  give 
  very 
  different 
  values 
  of 
  D 
  — 
  A 
  for 
  similar 
  

  

  values 
  of 
  D 
  — 
  W. 
  

  

  D. 
  

  

  W 
  r 
  

  

  W 
  2 
  . 
  

  

  A,. 
  

  

  K 
  

  

  D-Ai. 
  

  

  A 
  t 
  -A, 
  

  

  w 
  x 
  -w 
  2 
  . 
  

  

  Observer. 
  

  

  24-0 
  

  

  15-8 
  

  

  15-0 
  

  

  207 
  

  

  20-6 
  

  

  3-3 
  

  

  + 
  0-1 
  

  

  +0-8 
  

  

  M.K. 
  

  

  23-8 
  

  

  15-8 
  

  

  14-8 
  

  

  21-2 
  

  

  21-0 
  

  

  2-6 
  

  

  4-0-2 
  

  

  + 
  1-0 
  

  

  „ 
  

  

  23-8 
  

  

  160 
  

  

  153 
  

  

  18-6 
  

  

  18-2 
  

  

  5-2 
  

  

  +0-4 
  

  

  + 
  0-7 
  

  

  " 
  i 
  

  

  23-8 
  

  

  158 
  

  

  150 
  

  

  22-8 
  

  

  22-8 
  

  

  10 
  

  

  M 
  

  

  +0-8 
  

  

  1 
  

  

  23-7 
  

  

  16-1 
  

  

  153 
  

  

  23-7 
  

  

  23-8 
  

  

  

  

  -0-1 
  

  

  + 
  08 
  

  

  Jt 
  

  

  23-8 
  

  

  16-2 
  

  

  15-3 
  

  

  26-2 
  

  

  26-1 
  

  

  26 
  

  

  +0-1 
  

  

  +0-9 
  

  

  t1 
  

  

  23-7 
  

  

  16-2 
  

  

  153 
  

  

  29-6 
  

  

  29-2 
  

  

  5-9 
  

  

  + 
  0-4 
  

  

  +0-9 
  

  

  )} 
  

  

  23-6 
  

  

  16-0 
  

  

  15-3 
  

  

  27-5 
  

  

  28-0 
  

  

  -39 
  

  

  -05 
  

  

  -t-0-7 
  

  

  ,, 
  

  

  24-4 
  

  

  16-2 
  

  

  154 
  

  

  27-0 
  

  

  27-2 
  

  

  -2-6 
  

  

  -0-2 
  

  

  4-0-8 
  

  

  

  236 
  

  

  15-8 
  

  

  150 
  

  

  27-6 
  

  

  27-6 
  

  

  -40 
  

  

  

  

  4-0-8 
  

  

  W. 
  

  

  23-6 
  

  

  15-8 
  

  

  150 
  

  

  27-2 
  

  

  273 
  

  

  -26 
  

  

  -01 
  

  

  +0-8 
  

  

  

  23-4 
  

  

  16-0 
  

  

  15-2 
  

  

  260 
  

  

  26-0 
  

  

  -26 
  

  

  0^ 
  

  

  +0-8 
  

  

  1 
  

  

  23-4 
  

  

  156 
  

  

  14-8 
  

  

  25-4 
  

  

  25-6 
  

  

  -2-0 
  

  

  -0-2 
  

  

  +0-8 
  

  

  M 
  

  

  23-4 
  

  

  15-8 
  

  

  15-0 
  

  

  25-2 
  

  

  25-4 
  

  

  -1-8 
  

  

  -0-2 
  

  

  + 
  0-8 
  

  

  

  23-4 
  

  

  156 
  

  

  14-6 
  

  

  25-2 
  

  

  25-2 
  

  

  -2-2 
  

  

  0" 
  

  

  4-1-0 
  

  

  9J 
  

  

  23-4 
  

  

  15-8 
  

  

  15-0 
  

  

  24'8 
  

  

  24-9 
  

  

  -14 
  

  

  -0-1 
  

  

  +0-8 
  

  

  ,, 
  

  

  23-2 
  

  

  15-8 
  

  

  15-1 
  

  

  244 
  

  

  24-6 
  

  

  -1-2 
  

  

  -0-2 
  

  

  4-0-7 
  

  

  f} 
  

  

  230 
  

  

  160 
  

  

  14-8 
  

  

  244 
  

  

  24-5 
  

  

  -1-4 
  

  

  -01 
  

  

  -f-1-2 
  

  

  

  23-4 
  

  

  15-7 
  

  

  14-8 
  

  

  24-4 
  

  

  24-4 
  

  

  -1-0 
  

  

  

  

  4/0-9 
  

  

  M.S. 
  

  

  21-4 
  

  

  15-6 
  

  

  15-1 
  

  

  20-6 
  

  

  20-6 
  

  

  +0-8 
  

  

  

  

  4-0-5 
  

  

  W. 
  

  

  22-2 
  

  

  150 
  

  

  14-4 
  

  

  190 
  

  

  19-0 
  

  

  +3-2 
  

  

  

  

  4-0-6 
  

  

  ,, 
  

  

  22-2 
  

  

  14-9 
  

  

  14-2 
  

  

  19-9 
  

  

  19-9 
  

  

  + 
  2-3 
  

  

  

  

  +0-7 
  

  

  M.K. 
  

  

  22-6 
  

  

  15-4 
  

  

  14-8 
  

  

  20-8 
  

  

  208 
  

  

  +1-8 
  

  

  

  

  +06 
  

  

  ,, 
  

  

  22-8 
  

  

  156 
  

  

  14-9 
  

  

  18-5 
  

  

  18-1 
  

  

  +4-3 
  

  

  + 
  0-4 
  

  

  4-0-7 
  

  

  >> 
  

  

  (6) 
  Applicability 
  of 
  the 
  method. 
  — 
  The 
  method 
  is 
  recom- 
  

   mended 
  as 
  a 
  reference 
  method 
  to 
  those 
  who 
  wish 
  to 
  find 
  the 
  

   constants 
  for 
  their 
  wet 
  and 
  dry 
  bulb. 
  They 
  may 
  proceed 
  

   exactly 
  as 
  described 
  above, 
  preferably 
  taking 
  c 
  and 
  k 
  as 
  

   both 
  unknown. 
  The 
  method 
  is 
  also 
  available 
  as 
  a 
  substitute 
  

  

  