﻿1875.] 
  

  

  Theory 
  of 
  Ventilation. 
  

  

  197 
  

  

  Table 
  showing 
  the 
  same 
  from 
  Probable 
  Error 
  of 
  Result. 
  

  

  No. 
  of 
  Order. 
  Product. 
  Eatio. 
  

  

  1 
  32139057 
  1000-00 
  

  

  2 
  2661995 
  83-00 
  

  

  3 
  4794655 
  149-00 
  

  

  4 
  791570 
  25-00 
  

  

  5 
  7254 
  0-23 
  

  

  4&5 
  2373680 
  74-00 
  

  

  Here 
  we 
  see 
  a 
  greater 
  irregularity, 
  No. 
  3 
  showing 
  a 
  superiority 
  over 
  

   ]STo. 
  2, 
  due 
  probably 
  to 
  the 
  greater 
  number 
  of 
  individual 
  observations 
  in 
  

   the 
  former 
  case. 
  

  

  Taking 
  the 
  mean 
  of 
  the 
  ratios 
  by 
  the 
  two 
  methods, 
  we 
  have 
  - 
  

  

  No. 
  No. 
  

  

  1 
  = 
  1000 
  4 
  = 
  144 
  

  

  2 
  = 
  439 
  5 
  = 
  49 
  

  

  3 
  = 
  184 
  4&5= 
  135 
  

  

  But 
  the 
  discrepancy 
  in 
  the 
  ratios 
  of 
  the 
  values 
  from 
  the 
  probable 
  error, 
  

   w-here 
  No. 
  3 
  exceeds 
  No. 
  2, 
  is 
  due 
  to 
  the 
  irregularity 
  in 
  the 
  humidity 
  

   column 
  ; 
  and 
  as 
  this 
  is 
  not 
  an 
  independent 
  quantity, 
  but 
  dependent 
  on 
  

   the 
  temperature 
  and 
  vapour, 
  we 
  may 
  legitimately 
  omit 
  it. 
  We 
  shall 
  then 
  

   have 
  the 
  products 
  as 
  follows 
  : 
  — 
  

  

  Values 
  from 
  Mean 
  Error. 
  

   No. 
  Value. 
  Ratio. 
  

  

  1 
  61-40 
  1000 
  

  

  2 
  6-65 
  108 
  

  

  3 
  2-33 
  38 
  

  

  4 
  2-56 
  4-1 
  

  

  5 
  1-28 
  21 
  

  

  4&5 
  2-30 
  38 
  

  

  Yalues 
  from 
  Probable 
  Error 
  of 
  Result. 
  

  

  ' 
  No. 
  Value. 
  Ratio. 
  

  

  1 
  25382435 
  1000-00 
  

  

  2 
  5005632 
  ...... 
  197'00 
  

  

  3 
  4372692 
  ...... 
  172-00 
  

  

  4 
  1455360 
  57-00 
  

  

  5 
  36526 
  1-44 
  

  

  4&5 
  3079500 
  121-00 
  

  

  It 
  will 
  be 
  seen 
  that 
  in 
  the 
  calculation 
  from 
  mean 
  error 
  there 
  is 
  a 
  rise 
  

   at 
  No. 
  4 
  in 
  both 
  instances, 
  i. 
  e. 
  with 
  and 
  without 
  the 
  humidity. 
  There 
  is 
  

   a 
  fall 
  at 
  No. 
  5, 
  whilst 
  the 
  combined 
  series 
  4 
  and 
  5 
  gives 
  a 
  result 
  which 
  

   follows 
  naturally 
  after 
  No. 
  3. 
  We 
  may 
  now 
  reject 
  Nos. 
  4 
  and 
  5 
  as 
  sepa- 
  

  

  