﻿Resistance 
  of 
  Gases 
  during 
  an 
  Oscillatory 
  Discharge. 
  333 
  

  

  the 
  electricity 
  refused 
  to 
  pass 
  unless 
  the 
  spark 
  gap 
  was 
  nar- 
  

   rowed. 
  

  

  In 
  the 
  first 
  column 
  of 
  each 
  table 
  below 
  is 
  recorded 
  the 
  pres- 
  

   sure 
  of 
  the 
  gas, 
  in 
  the 
  second, 
  third 
  and 
  fourth 
  are 
  recorded 
  

   the 
  numbers 
  of 
  half 
  oscillations 
  obtained 
  with 
  the 
  three 
  differ- 
  

   ent 
  capacities 
  respectively, 
  while 
  in 
  the 
  fifth, 
  sixth, 
  and 
  seventh 
  

   of 
  these 
  columns 
  are 
  to 
  be 
  found 
  the 
  resistances 
  corresponding 
  

   to 
  these 
  oscillations, 
  each 
  value 
  being 
  taken 
  from 
  its 
  proper 
  

   curve 
  in 
  fig. 
  2. 
  In 
  order 
  to 
  give 
  a 
  better 
  idea 
  of 
  the 
  compari- 
  

   son 
  and 
  the 
  way 
  in 
  which 
  the 
  oscillations 
  are 
  damped, 
  repro- 
  

   ductions 
  from 
  two 
  photographs 
  are 
  given 
  in 
  Plate 
  VI. 
  

  

  The 
  Resistance 
  of 
  Hydrogen. 
  

  

  

  Number 
  of 
  half 
  oscillations. 
  

  

  Eesistance 
  in 
  ohms. 
  

  

  Pressure 
  of 
  

  

  

  

  

  

  

  

  gas. 
  

  

  Capacity 
  = 
  

  

  Capacity 
  = 
  

  

  Capacity 
  = 
  

  

  Capacity 
  = 
  

  

  Capacity= 
  

  

  Capacity 
  = 
  

  

  

  6,000. 
  

  

  12,000. 
  

  

  18,000. 
  

  

  6,000. 
  

  

  12,000. 
  

  

  18.000. 
  

  

  millimeters 
  

  

  

  

  ohms 
  

  

  ohms 
  over 
  

  

  ohms 
  

  

  13-5 
  

  

  

  

  

  

  

  100 
  

  

  

  10-0 
  

  

  i 
  

  

  2" 
  

  

  

  2 
  

  

  50 
  ? 
  

  

  

  15 
  

  

  5-0 
  

  

  1 
  

  

  2 
  

  

  2 
  

  

  30 
  

  

  20 
  

  

  15 
  

  

  3'6 
  

  

  

  2 
  

  

  

  

  20 
  

  

  

  3-0 
  

  

  

  3 
  

  

  3 
  

  

  

  15 
  

  

  10 
  

  

  2'0 
  

  

  2 
  

  

  3 
  

  

  3 
  

  

  20 
  

  

  15 
  

  

  10 
  

  

  1-8 
  

  

  

  3 
  

  

  

  

  15 
  

  

  

  1*25 
  

  

  3 
  

  

  3 
  

  

  4 
  

  

  15 
  

  

  15 
  

  

  7 
  

  

  1-15 
  

  

  

  4 
  

  

  

  

  10 
  

  

  

  0*85 
  

  

  

  54 
  

  

  

  

  9 
  

  

  

  0-75 
  

  

  

  6J 
  

  

  

  

  5* 
  

  

  

  0-60 
  

  

  

  i 
  

  

  6 
  

  

  

  5 
  

  

  5 
  

  

  0-40 
  

  

  

  6 
  

  

  

  

  6- 
  

  

  

  0-31 
  

  

  H 
  

  

  7 
  

  

  6 
  

  

  1 
  

  

  5- 
  

  

  5 
  

  

  0*21 
  

  

  

  6 
  

  

  

  

  d* 
  

  

  

  0-15 
  

  

  5 
  

  

  

  6 
  + 
  

  

  10 
  

  

  

  5 
  

  

  o-i 
  

  

  

  HP) 
  

  

  

  

  7? 
  

  

  

  0-05 
  

  

  H 
  

  

  no 
  spark 
  

  

  no 
  spark 
  

  

  11 
  

  

  

  

  Besides 
  these 
  measurements 
  of 
  hydrogen 
  and 
  nitrogen, 
  sev- 
  

   eral 
  photographs 
  were 
  made 
  of 
  sparks 
  sent 
  through 
  some 
  of 
  

   Lord 
  Eayleigh's 
  argon 
  contained 
  in 
  sealed 
  tubes. 
  Since 
  the 
  

   capillaries 
  were 
  not 
  in 
  every 
  case 
  equal 
  in 
  diameter, 
  the 
  results 
  

   are 
  not 
  wholly 
  comparable 
  with 
  one 
  another 
  or 
  with 
  those 
  in 
  

   the 
  two 
  tables 
  given 
  above. 
  Two 
  half 
  oscillations 
  each 
  were 
  

  

  Am. 
  

  

  Jour. 
  Sci. 
  

   23 
  

  

  •Fourth 
  Series, 
  Yol. 
  Ill, 
  No. 
  16.— 
  April, 
  1897. 
  

  

  