﻿470 
  Mr. 
  L. 
  Yegard 
  on 
  the 
  Electric 
  Discharge 
  

  

  Table 
  I. 
  

   HCl. 
  

  

  p- 
  

  

  10^1. 
  

  

  Gm. 
  

  

  A— 
  1. 
  

  

  A-2. 
  

  

  A-3.i 
  

  

  A— 
  4. 
  

  

  A-5. 
  

  

  A-K. 
  

  

  Type. 
  

  

  mm. 
  

  

  o-2(; 
  

  

  am. 
  

   0-30 
  

  

  9-9 
  

  

  volt/cm. 
  

   35-5 
  

  

  361 
  

  

  Tolt 
  

  

  80 
  

   66 
  

  

  volt 
  

   242 
  

  

  186 
  

  

  volt 
  

   300 
  

  

  239 
  

  

  volt 
  

   309 
  

  

  299 
  

  

  volt 
  

   243 
  

  

  349 
  

  

  volt. 
  

   542 
  

  

  781 
  

  

  U 
  

  

  0-22 
  

  

  29-2 
  

  

  22-5 
  

  

  40 
  

  

  87 
  

  

  219 
  

  

  128 
  

  

  129 
  

  

  172 
  

  

  227 
  

  

  782 
  

  

  S 
  

  

  0-50 
  

  

  1-3 
  

  

  22-0 
  

  

  36-0 
  

   41-6 
  

  

  80 
  

   39 
  

  

  263 
  

   175 
  

  

  311 
  

   307 
  

  

  318 
  

   380 
  

  

  612 
  

  

  859 
  

  

  u 
  

  

  0-43 
  

  

  115 
  

  

  14-1 
  

  

  36 
  

  

  73 
  

  

  112 
  

  

  127 
  

  

  139 
  

  

  984 
  

  

  s 
  

  

  0-75 
  

  

  0-41 
  

   12-6 
  

  

  40-8 
  

  

  49-8 
  

  

  98 
  

   56 
  

  

  207 
  

   177 
  

  

  235 
  

   273 
  

  

  361 
  

   377 
  

  

  492 
  

  

  396 
  

  

  755 
  

   804 
  

  

  u 
  

  

  0-60 
  

  

  90 
  

  

  202 
  

  

  34 
  

  

  104 
  

  

  159 
  

  

  165 
  

  

  172 
  

  

  734 
  

  

  s 
  

  

  1-2 
  

  

  9-3 
  

  

  45 
  

  

  80 
  

  

  95 
  

  

  105 
  

  

  174 
  

  

  438 
  

  

  D 
  

  

  1-6 
  

  

  1-15 
  

  

  35-8 
  

  

  75-0 
  

   93-0 
  

  

  129 
  

   63 
  

  

  367 
  

  

  287 
  

  

  538 
  

   477 
  

  

  013 
  

   666 
  

  

  704 
  

   804 
  

  

  1024 
  

   1171 
  

  

  u 
  

  

  " 
  ! 
  

  

  For 
  the 
  uniform 
  discharge 
  is 
  given 
  the 
  distribution 
  corre- 
  

   sponding 
  to 
  the 
  biggest 
  and 
  smallest 
  currents 
  which 
  for 
  each 
  

   pressure 
  are 
  observed 
  tor 
  this 
  form 
  o£ 
  discharge. 
  

  

  On 
  the 
  Stability 
  of 
  the 
  Different 
  Fo7ins 
  of 
  Discharge. 
  

  

  § 
  6. 
  In 
  order 
  to 
  get 
  the 
  greatest 
  possible 
  current-interval 
  

   for 
  the 
  uniform 
  discharge 
  we 
  must 
  take 
  care 
  not 
  to 
  begin 
  

   the 
  discharge 
  with 
  too 
  large 
  a 
  current, 
  but 
  it 
  is 
  advisable 
  to 
  

   undertake 
  the 
  measurements 
  in 
  the 
  order 
  of 
  increasing- 
  

   currents 
  and 
  begin 
  with 
  the 
  lowest 
  that 
  can 
  be 
  made 
  to 
  pass. 
  

  

  When 
  the 
  current 
  becomes 
  somewhat 
  large 
  the 
  uniform 
  

   type 
  will 
  be 
  unstable. 
  Striations 
  set 
  in 
  generally 
  accom- 
  

   panied 
  by 
  a 
  rapid 
  increase 
  in 
  the 
  current, 
  which 
  means 
  a 
  

   fall 
  in 
  the 
  potential- 
  difference 
  between 
  the 
  electrodes. 
  

  

  For 
  very 
  small 
  pressures 
  the 
  change 
  sometimes 
  takes 
  

   place 
  with 
  diminution 
  of 
  current. 
  This 
  is 
  due 
  to 
  an 
  increase 
  

   in 
  the 
  cathode 
  fall, 
  which 
  is 
  caused 
  partly 
  by 
  the 
  diminution 
  

   in 
  pressure 
  that 
  generally 
  accompanies 
  this 
  change 
  at 
  low 
  

   pressures. 
  

  

  Also 
  the 
  striated 
  form 
  becomes 
  unstable 
  for 
  very 
  large 
  

   currents, 
  the 
  positive 
  column 
  is 
  gradually 
  '' 
  driven 
  into 
  the 
  

   anode,^^ 
  leaving 
  the 
  positive 
  column 
  dark 
  behind 
  or 
  rather 
  

  

  