﻿Special 
  Case 
  of 
  Gaseous 
  Conduction, 
  

  

  917 
  

  

  important 
  range 
  the 
  current 
  was 
  almost 
  perfectly 
  * 
  saturated 
  

   for 
  such 
  a 
  voltage, 
  but 
  at 
  the 
  higher 
  pressures 
  in 
  air 
  and 
  

   carbon 
  dioxide, 
  Bragg's 
  " 
  initial 
  recombination 
  " 
  appeared, 
  

   so 
  that 
  the 
  value 
  attributed 
  to 
  I 
  may 
  be 
  too 
  small 
  ; 
  at 
  the 
  

   very 
  lowest 
  pressures 
  there 
  was 
  some 
  indication 
  of 
  ionization 
  

   by 
  collision, 
  so 
  that 
  I 
  may 
  be 
  slightly 
  too 
  great. 
  

  

  Table 
  II. 
  

   Air 
  ; 
  21 
  = 
  2' 
  6 
  mm. 
  I/jo^-3'1 
  x 
  10 
  -15 
  amp./cmA 
  

  

  p 
  (in 
  mm.). 
  

   10 
  

  

  • 
  

  

  Hi. 
  

  

  V=0l 
  volt. 
  

   0-445 
  

  

  V=0-2 
  volt. 
  

   0-667 
  

  

  

  36 
  

  

  0-470 
  

   0-485 
  

   0-475 
  

   0-474 
  

   0-476 
  

   0-485 
  

  

  0-711 
  

   0-720 
  

   0-724 
  

   0-723 
  

   0-719 
  

   0-718 
  

  

  73 
  

  

  82 
  

  

  96 
  

  

  109 
  

  

  132 
  

  

  

  178 
  

  

  292 
  

  

  415 
  

  

  0-454 
  

   0-396 
  

   0-310 
  

   0-240 
  

   161 
  

  

  0-477 
  

  

  0-705 
  

   647 
  

   0523 
  

   0425 
  

   0294 
  

  

  0719 
  

  

  520 
  

  

  715 
  

  

  Mean 
  

  

  

  Table 
  III. 
  

   Hydrogen; 
  2Z 
  = 
  0*9 
  mm. 
  I/p-^.2'3 
  X 
  10" 
  16 
  amp./cm. 
  

  

  p 
  (in 
  mm.). 
  

  

  i/I. 
  

  

  V= 
  0-1 
  volt. 
  

  

  V 
  = 
  0-2 
  volt. 
  

  

  178 
  

  

  0-454 
  

   0-461 
  

   0-463 
  

   0-459 
  

  

  0-698 
  

   0-710 
  

   0-705 
  

   0-697 
  

  

  374 
  

  

  503 
  .. 
  

  

  765 
  

  

  Mean 
  

  

  459 
  

  

  0-702 
  

  

  

  * 
  Changes 
  in 
  the 
  current 
  of 
  less 
  than 
  1 
  in 
  2000 
  could 
  he 
  detected. 
  [ 
  

   have 
  never 
  heen 
  ahle 
  to 
  saturate 
  any 
  gas 
  to 
  this 
  degree 
  of 
  accuracy, 
  but 
  

   the 
  current 
  did 
  not 
  increase 
  more 
  than 
  1 
  in 
  1000 
  when 
  V 
  was 
  increased 
  

   from 
  40 
  to 
  200. 
  

  

  