﻿928 
  Dr. 
  J. 
  W. 
  McBain 
  on 
  the 
  Mechanism 
  of 
  the 
  

  

  Table 
  XII. 
  

  

  Remarks. 
  

  

  Time. 
  

  

  Pressure. 
  

  

  Difference. 
  

  

  Added 
  35-39 
  c. 
  c. 
  (corr.) 
  

  

  0-10 
  second. 
  

  

  _ 
  

  

  

  1 
  

  

  I 
  minute. 
  

  

  380 
  mm. 
  

  

  

  

  

  2 
  minutes. 
  

  

  280 
  „ 
  

  

  — 
  100 
  mm. 
  

  

  

  3 
  

  

  255 
  „ 
  

  

  - 
  125 
  „ 
  

  

  Took 
  out 
  5-60 
  c.c. 
  (corr.) 
  ... 
  

  

  3^ 
  „ 
  

  

  

  

  1 
  ■ 
  

  

  5 
  „ 
  

  

  139-1 
  mm. 
  

  

  

  

  

  6 
  

  

  134-8 
  „ 
  

  

  — 
  4-3 
  mm. 
  

  

  

  9 
  

  

  127-9 
  „ 
  

  

  -11-2 
  „ 
  

  

  

  39 
  

  

  108-5 
  „ 
  

  

  -30-6 
  „ 
  

  

  ■ 
  

  

  227 
  „ 
  

  

  95-7 
  „ 
  

  

  - 
  43-4 
  „ 
  

  

  

  8 
  hours. 
  

  

  89-0 
  „ 
  

  

  - 
  50-1 
  „ 
  

  

  

  9 
  

  

  88-0 
  „ 
  

  

  - 
  51-1 
  „ 
  

  

  

  10 
  „ 
  

  

  87-7 
  „ 
  

  

  -51-4 
  „ 
  

  

  

  19 
  „ 
  

  

  89-4 
  „ 
  

  

  -49-7 
  „ 
  

  

  

  23 
  „ 
  

  

  90-8 
  „ 
  

  

  -48-3 
  „ 
  

  

  Table 
  XIII. 
  

  

  Remarks. 
  

  

  Time. 
  

  

  Pressure. 
  

  

  Difference. 
  

  

  Put 
  in 
  42-17 
  c. 
  c. 
  (corr.) 
  

  

  minute. 
  

  

  

  

  

  1 
  

  

  495 
  mm. 
  

  

  — 
  

  

  

  3 
  minutes. 
  

  

  405 
  „ 
  

  

  

  

  Took 
  out 
  6-34 
  c. 
  c. 
  (corr.) 
  ... 
  

  

  3^31 
  „ 
  

  

  — 
  

  

  — 
  

  

  

  5 
  

  

  231-0 
  mm. 
  

  

  — 
  

  

  

  71 
  „ 
  

  

  220-5 
  „ 
  

  

  - 
  10-5 
  mm. 
  

  

  

  12 
  „ 
  

  

  200-6 
  „ 
  

  

  -30-4 
  „ 
  

  

  

  32 
  

  

  178-7 
  „ 
  

  

  -52-3 
  „ 
  

  

  

  100 
  

  

  165-9 
  „ 
  

  

  - 
  65-1 
  „ 
  

  

  

  4k 
  hours. 
  

  

  161-5 
  „ 
  

  

  -69-5 
  „ 
  

  

  

  lOi 
  ,, 
  

  

  160-5 
  „ 
  

  

  -70-5 
  „ 
  

  

  

  11 
  „ 
  

  

  160-7 
  „ 
  

  

  -70-3 
  „ 
  

  

  

  23 
  „ 
  

  

  165-0 
  „ 
  

  

  -66-0 
  „ 
  

  

  Less 
  than 
  ever 
  can 
  these 
  experiments 
  realize 
  the 
  full 
  value 
  

   o£ 
  the 
  diffusion 
  effect. 
  Table 
  XII. 
  yields 
  the 
  following- 
  

   computation 
  : 
  — 
  Volume 
  of 
  bulb 
  7*40 
  c.c. 
  Total 
  gas 
  taken 
  

   up 
  by 
  the 
  carbon 
  at 
  5 
  minutes 
  and 
  10 
  hours, 
  25*10 
  c.c. 
  

   (corr.) 
  and 
  26*84 
  c. 
  c. 
  (corr.). 
  Minimum 
  pressure 
  87*7 
  mm.; 
  

   corrected 
  for 
  temperature 
  drift 
  84*2 
  mm., 
  and 
  for 
  extra 
  gas 
  

   sorbed 
  68*9 
  mm. 
  The 
  ratio 
  between 
  the 
  final 
  and 
  initial 
  

   surface 
  hydrogen 
  is 
  therefore 
  79 
  per 
  cent. 
  The 
  carbon 
  

   weighed 
  0*626 
  g. 
  The 
  dissolved 
  hydrogen 
  at 
  a 
  pressure 
  of 
  

   88 
  mm. 
  is 
  therefore 
  8*9 
  c.c. 
  (corr.) 
  per 
  gram 
  of 
  carbon. 
  

  

  The 
  corresponding 
  calculation 
  for 
  Table 
  XIII. 
  : 
  — 
  Bulb 
  

  

  