﻿"Resistance 
  of 
  Gases 
  during 
  an 
  Oscillatory 
  Discharge. 
  329 
  

  

  resistance 
  and 
  how 
  much 
  to 
  a 
  kind 
  of 
  polarization, 
  but 
  it 
  is 
  

   convenient 
  for 
  present 
  purposes 
  to 
  count 
  it 
  all 
  as 
  resistance. 
  

  

  In 
  any 
  case 
  this 
  opposition, 
  if 
  maintained, 
  is 
  far 
  too 
  great 
  to 
  

   permit 
  the 
  passage 
  of 
  oscillations, 
  even 
  under 
  the 
  most 
  favor- 
  

   able 
  conditions. 
  In 
  order 
  to 
  prove 
  that 
  the 
  opposition 
  is 
  not 
  

   maintained, 
  but 
  is 
  in 
  fact 
  broken 
  clown 
  by 
  the 
  spark, 
  it 
  was 
  

   only 
  necessary 
  to 
  photograph 
  the 
  discharge 
  with 
  the 
  help 
  of 
  a 
  

   rapidly 
  revolving 
  mirror, 
  after 
  the 
  method 
  of 
  Feddersen. 
  

   Unfortunately 
  the 
  light 
  in 
  the 
  tube 
  itself 
  is 
  too 
  faint 
  for 
  direct 
  

   instantaneous 
  photography 
  ; 
  but 
  the 
  light 
  of 
  the 
  spark 
  between 
  

   two 
  cadmium 
  electrodes 
  in 
  the 
  same 
  circuit 
  is 
  quite 
  bright 
  

   enough 
  for 
  the 
  purpose, 
  and 
  of 
  course 
  any 
  oscillations 
  which 
  

   crossed 
  the 
  spark 
  gap 
  must 
  also 
  go 
  through 
  the 
  tube. 
  Our 
  

   next 
  step 
  was, 
  therefore, 
  to 
  make 
  a 
  series 
  of 
  such 
  photographs 
  

   of 
  a 
  spark 
  discharged 
  through 
  hydrogen, 
  at 
  first 
  when 
  the 
  gas 
  

   glowed 
  with 
  a 
  white 
  light 
  and 
  showed 
  its 
  many-line 
  spectrum, 
  

   and 
  afterwards, 
  when 
  it 
  exhibited 
  the 
  characteristic 
  red 
  tint 
  

   and 
  a 
  spectrum 
  of 
  only 
  four 
  lines 
  in 
  the 
  visible 
  portion 
  of 
  the 
  

   spectrum. 
  

  

  Fig. 
  1. 
  B 
  = 
  Battery 
  of 
  5.000 
  to 
  10.000 
  storage 
  cells. 
  

   C 
  = 
  Condenser 
  of 
  1,000 
  to 
  18,000 
  electrostat 
  

   R 
  = 
  Small 
  resistance 
  to 
  damp 
  oscillations. 
  

   S 
  = 
  Spark 
  gap 
  between 
  cadmium 
  terminals. 
  

   T 
  = 
  Pliicker 
  lube 
  containing 
  gas. 
  

   W 
  = 
  Chief 
  water 
  resistance 
  of 
  5 
  to 
  50 
  megon 
  

  

  ic 
  unit? 
  

  

  In 
  order 
  to 
  obtain 
  the 
  white 
  light 
  in 
  the 
  hydrogen 
  tube, 
  .it 
  

   was 
  necessary 
  to 
  increase 
  either 
  the 
  impedance 
  or 
  the 
  resistance 
  

   in 
  the 
  circuit 
  containing 
  the 
  tube. 
  With 
  a 
  definite 
  very 
  small 
  

   amount 
  of 
  impedance 
  we 
  increased 
  the 
  resistance 
  until 
  the 
  

  

  