﻿Resistance 
  of 
  Gases- 
  during 
  an 
  Oscillatory 
  Discharge. 
  335 
  

  

  III. 
  Down 
  to 
  a 
  very 
  small 
  pressure, 
  this 
  resistance 
  decreases 
  

   101th 
  the 
  tension 
  of 
  the 
  gas. 
  At 
  a 
  pressure 
  considerably 
  below 
  

   the 
  minima 
  in 
  the 
  potential 
  curves 
  given 
  on 
  p. 
  328 
  the 
  resist- 
  

   ance 
  seems 
  to 
  reach 
  a 
  minimum, 
  but 
  the 
  irregularity 
  of 
  the 
  

   sparks 
  in 
  this 
  region 
  make 
  this 
  last 
  minimum 
  somewhat 
  uncer- 
  

  

  FiG. 
  3. 
  Ohms 
  are 
  plotted 
  horizontally. 
  

  

  Millimeters 
  of 
  pressure 
  are 
  plotted 
  vertically. 
  

  

  tain. 
  The 
  minima 
  of 
  resistance 
  probably 
  vary 
  with 
  the 
  quan- 
  

   tity 
  of 
  electricity 
  discharged 
  as 
  well 
  as 
  with 
  the 
  specific 
  prop- 
  

   erties 
  of 
  the 
  gas. 
  The 
  minimum 
  for 
  nitrogen 
  is 
  attained 
  at 
  a 
  

   much 
  lower 
  pressure 
  than 
  that 
  of 
  hydrogen. 
  

  

  