﻿Conductivity 
  imparted 
  to 
  Liquid 
  Air 
  by 
  Alpha 
  Rays. 
  891 
  

  

  them 
  are 
  shown 
  in 
  figs. 
  8 
  and 
  9 
  (PL 
  XVIII.)- 
  In 
  both 
  

   diagrams 
  the 
  values 
  of 
  "?/" 
  are 
  taken 
  as 
  ordinate?, 
  but 
  the 
  

   values 
  of 
  "V" 
  are 
  taken 
  as 
  abscissae 
  in 
  fig. 
  8 
  and 
  the 
  values 
  

   OH 
  V 
  2 
  in 
  fig. 
  9. 
  

  

  Table 
  VII. 
  

  

  Mobility 
  of 
  positive 
  ion=/k 
  v 
  Mobility 
  of 
  negative 
  ion=£ 
  2 
  . 
  

   Pressure^ 
  Li6*l 
  atmospheres. 
  

  

  Positive 
  ion. 
  

   0-0005294, 
  0-06152. 
  

  

  Negative 
  ion. 
  

   k 
  2 
  = 
  P 
  . 
  lc 
  = 
  

   0-0006217, 
  007224. 
  

  

  Katio/y 
  7^3= 
  1-18. 
  

  

  Ivo-varik's 
  Results 
  for 
  pressures 
  up 
  to 
  75 
  atmospheres. 
  

   P. 
  ^ 
  = 
  1-346. 
  P. 
  7^ 
  = 
  189. 
  

  

  From 
  the 
  numbers 
  given 
  in 
  Table 
  VII. 
  and 
  from 
  the 
  

   curves 
  in 
  figs. 
  8 
  and 
  9, 
  it 
  will 
  be 
  seen 
  that 
  for 
  potentials 
  

   up 
  to 
  about 
  800 
  volts, 
  the 
  relation 
  between 
  y 
  and 
  V 
  2 
  is 
  

   practically 
  a 
  linear 
  one, 
  and 
  that 
  the 
  mobility 
  of 
  the 
  negative 
  

   ion 
  is 
  about 
  18 
  per 
  cent, 
  greater 
  than 
  that 
  of 
  the 
  positive. 
  

   This 
  would 
  go 
  to 
  show 
  that 
  one 
  is 
  warranted 
  in 
  applying 
  

   the 
  Rutherford-Child 
  relation 
  to 
  the 
  present 
  experiments. 
  

   But 
  the 
  absolute 
  values 
  of 
  the 
  mobilities 
  which 
  have 
  been 
  

   deduced 
  from 
  the 
  numbers 
  given 
  in 
  Table 
  A 
  7 
  " 
  II. 
  are 
  much 
  

   smaller 
  than 
  one 
  should 
  expect 
  them 
  to 
  be 
  if 
  the 
  inverse 
  

   pressure 
  law 
  applied 
  up 
  to 
  116 
  atmospheres. 
  

  

  Kovarik 
  has 
  shown 
  that 
  this 
  law 
  applies 
  in 
  the 
  ca«e 
  of 
  air 
  

   up 
  to 
  75 
  atmospheres, 
  and 
  for 
  positive 
  ions 
  up 
  to 
  this 
  limit 
  

   he 
  finds 
  pk 
  1 
  -=l'34S 
  and 
  for 
  the 
  negative 
  _p& 
  2 
  = 
  1'89. 
  The 
  

   mobility 
  for 
  the 
  positive 
  ion 
  deduced 
  from 
  these 
  experi- 
  

   ments 
  is 
  there 
  only 
  about 
  1/22 
  and 
  that 
  of 
  the 
  negative 
  

   ion 
  1/2(3 
  of 
  what 
  one 
  should 
  expect 
  to 
  get 
  if 
  the 
  inverse 
  

   pressure 
  law 
  held 
  between 
  75 
  and 
  116 
  atmospheres. 
  If 
  the 
  

   results 
  obtained 
  be 
  correct 
  it 
  would 
  follow 
  that 
  the 
  inverse 
  

   pressure 
  law 
  does 
  not 
  apply 
  in 
  this 
  region. 
  

  

  On 
  the 
  other 
  hand, 
  it 
  is 
  just 
  possible 
  that 
  one 
  is 
  not 
  

   justified 
  in 
  assuming 
  the 
  effective 
  cross-section 
  of 
  the 
  flow 
  

   of 
  current 
  between 
  the 
  electrodes 
  to 
  be 
  the 
  area 
  of 
  the 
  

   opening 
  in 
  the 
  ebonite 
  plate 
  EF. 
  There 
  would 
  be 
  a 
  

   tendency 
  for 
  the 
  ions 
  in 
  passing 
  across 
  the 
  field 
  to 
  diffuse 
  

   to 
  the 
  walls 
  of 
  this 
  opening, 
  and 
  if 
  such 
  diffusion 
  did 
  occur 
  

  

  