﻿$22 
  Mr. 
  H. 
  L. 
  P. 
  Jolly 
  on 
  the 
  

  

  than 
  those 
  obtained 
  in 
  rapid 
  succession 
  or 
  the 
  final 
  deflexion 
  

   obtained 
  by 
  holding 
  on 
  the 
  discharge 
  for 
  a 
  period, 
  say, 
  of 
  

   ten 
  seconds. 
  

  

  There 
  are 
  two 
  courses 
  open 
  : 
  either 
  the 
  readings 
  must 
  be 
  

   obtained 
  in 
  rapid 
  succession 
  or 
  an 
  interval 
  of 
  at 
  least 
  2 
  

   minutes 
  must 
  be 
  allowed 
  between 
  consecutive 
  observations. 
  

  

  Owing 
  to 
  the 
  great 
  heating 
  of 
  the 
  tube 
  if 
  readings 
  were 
  

   taken 
  rapidly, 
  and 
  the 
  necessity 
  for 
  waiting 
  at 
  times 
  between 
  

   readings, 
  to 
  set 
  the 
  spectroscope, 
  the 
  latter 
  of 
  the 
  two 
  

   alternatives 
  was 
  chosen. 
  

  

  We 
  next 
  give 
  some 
  observations 
  on 
  the 
  shift 
  of 
  energy 
  in 
  

   the 
  spectrum 
  of 
  hydrogen, 
  making 
  use 
  this 
  time 
  of 
  the 
  two 
  

   lines 
  H„ 
  and 
  H^ 
  instead 
  of 
  H„ 
  and 
  the 
  whole 
  energ} 
  r 
  . 
  

  

  Curve 
  6 
  (Pi. 
  XIV.) 
  shows 
  the 
  results 
  at 
  a 
  pressure 
  of 
  

   2" 
  9 
  cm. 
  of 
  mercury, 
  and 
  Curve 
  7 
  those 
  at 
  6'S 
  cm. 
  pressure. 
  

  

  We 
  may 
  summarize 
  them 
  as 
  follows 
  : 
  — 
  

  

  Curve 
  6 
  : 
  — 
  

  

  Pressure 
  = 
  2*9 
  cm, 
  

  

  Curve 
  7 
  : 
  — 
  

  

  Pressure 
  s= 
  G* 
  8 
  cm, 
  

  

  ( 
  (a) 
  Weak 
  Current 
  ?£ 
  = 
  £|* 
  = 
  0-181 
  

   ) 
  (b) 
  Strong 
  Current, 
  S? 
  = 
  ^ 
  =0\L63 
  

  

  0-264 
  

  

  (a) 
  Weak 
  Current, 
  „- 
  = 
  — 
  ^ 
  

  

  (b) 
  Strong 
  Current,^ 
  = 
  ~ 
  = 
  0'206 
  

  

  1*1 
  =1-28 
  

  

  On 
  plotting 
  the 
  results, 
  together 
  with 
  those 
  of 
  Table 
  III., 
  

   and 
  using 
  respectively 
  

  

  H,3 
  / 
  , 
  . 
  H 
  whole 
  , 
  ' 
  

  

  yy~ 
  (weak 
  current) 
  — 
  ^ 
  — 
  - 
  (weak 
  current) 
  

  

  li» 
  * 
  , 
  Hq 
  

  

  H/3 
  , 
  , 
  . 
  N 
  H 
  whole 
  , 
  , 
  ,. 
  

  

  vp 
  (strong 
  current) 
  ■ 
  n 
  (strong 
  current) 
  

  

  -tla 
  Ma 
  

  

  as 
  variables 
  against 
  pressure, 
  we 
  get 
  the 
  interesting 
  results 
  

  

  shown 
  in 
  Curve 
  8. 
  At 
  all 
  pressures 
  there 
  is 
  evidence 
  of 
  a 
  

  

  shift 
  of 
  energy, 
  since 
  the 
  variable 
  differs 
  from 
  unity. 
  The 
  

  

  fact 
  that 
  the 
  quantities 
  appear 
  to 
  form 
  a 
  straight 
  line 
  in 
  the 
  

  

  « 
  H 
  whole 
  tip 
  i 
  i 
  . 
  i 
  

  

  case 
  or 
  — 
  ^f 
  — 
  can 
  scarcely 
  be 
  or 
  much 
  value, 
  but 
  the 
  

  

  -tla 
  

  

  