﻿THE 
  

   LONDON, 
  EDINBURGH 
  and 
  DUBLIN 
  

  

  PHILOSOPHICAL 
  MAGAZINE 
  

  

  AND 
  

  

  JOURNAL 
  OF 
  SCIENCE. 
  

  

  [SIXTH 
  SERIES.] 
  

  

  NOVEMBER 
  1913. 
  

  

  LXIX. 
  The 
  Distribution 
  of 
  Energy 
  in 
  the 
  Spectra 
  of 
  Gases. 
  

   By 
  H. 
  L. 
  P. 
  Jolly, 
  M.A., 
  late 
  Senior 
  Scholar, 
  Irinity 
  

  

  College, 
  Cambridg 
  

  

  * 
  

  

  [Plates 
  XIII. 
  & 
  XIV.] 
  

  

  Contents. 
  

  

  Page 
  

  

  1. 
  Introduction 
  , 
  801 
  

  

  2. 
  Summary 
  of 
  Previous 
  Work 
  on 
  the 
  Subject 
  803 
  

  

  3. 
  Description 
  of 
  Preliminary 
  Experiments 
  805 
  

  

  4. 
  Experiments 
  with 
  a 
  Paschen 
  Galvanometer 
  808 
  

  

  A. 
  The 
  radiation 
  from 
  the 
  non-disruptive 
  discharge 
  

  

  in 
  hydrogen 
  '. 
  809 
  

  

  B. 
  Displacement 
  of 
  energy 
  in 
  the 
  spectrum 
  816 
  

  

  O. 
  The 
  continuous 
  distribution 
  of 
  energy 
  in 
  the 
  

  

  spectrum 
  823 
  

  

  1. 
  Introduction. 
  

  

  THE 
  object 
  o£ 
  the 
  investigations 
  described 
  in 
  this 
  paper 
  

   was, 
  in 
  the 
  first 
  instance, 
  to 
  determine 
  quantitatively 
  

   the 
  manner 
  in 
  which 
  the 
  energy 
  distribution 
  among 
  the 
  

   lines 
  of 
  a 
  bright 
  line 
  spectrum 
  varied 
  when 
  the 
  intensity 
  

   o£ 
  excitation 
  was 
  changed. 
  Prof. 
  Sir 
  J. 
  J. 
  Thomson 
  had 
  

   suggested 
  that 
  Planck's 
  theory 
  of 
  indivisible 
  " 
  quanta 
  " 
  of 
  

   radiant 
  energy 
  might 
  manifest 
  its 
  truth 
  in 
  a 
  discontinuous 
  

   or 
  step-like 
  change 
  in 
  the 
  intensity 
  o£ 
  a 
  spectrum 
  line 
  ; 
  in 
  

   other 
  words, 
  that 
  the 
  relative 
  energy 
  of 
  two 
  lines 
  belonging 
  

   to 
  a 
  series 
  might 
  change 
  in 
  a 
  manner 
  represented 
  by 
  small 
  

  

  * 
  Communicated 
  by 
  Sir 
  J. 
  J. 
  Thomson, 
  O.M., 
  F.R.S. 
  

   Phil. 
  Mag. 
  S. 
  6. 
  Vol. 
  26. 
  No. 
  155. 
  Nov. 
  1913. 
  3 
  I 
  

  

  