﻿474 
  Dimstan, 
  Rice 
  and 
  Kraus 
  — 
  Sodium 
  l^ines, 
  etc. 
  

  

  in 
  the 
  neighborhood 
  of 
  3000 
  C. 
  G. 
  S. 
  units 
  (estimated). 
  The 
  

   other 
  two 
  curves 
  were 
  taken 
  with 
  weaker 
  fields. 
  The 
  relative 
  

   strengths 
  of 
  field 
  w 
  r 
  ere 
  in 
  the 
  same 
  order 
  as 
  the 
  shortening 
  of 
  

   the 
  curves. 
  

  

  It 
  is 
  thus 
  seen 
  that 
  the 
  two 
  sodium 
  lines 
  are 
  broadened 
  by 
  

   the 
  most 
  intense 
  field 
  about 
  in 
  the 
  ratio 
  of 
  1 
  to 
  1*7, 
  and 
  less 
  

   with 
  weaker 
  fields. 
  

  

  The 
  effect 
  is 
  very 
  decided 
  when 
  a 
  difference 
  of 
  path 
  of 
  10 
  

   to 
  18 
  mm 
  is 
  reached. 
  The 
  fringes 
  are 
  quite 
  distinct 
  with 
  no 
  

   magnetic 
  field 
  but 
  are 
  almost 
  entirely 
  obliterated 
  when 
  the 
  

   current 
  is 
  turned 
  on. 
  

  

  No 
  special 
  adjustment 
  of 
  the 
  apparatus 
  is 
  necessary 
  beyond 
  

   that 
  ordinarily 
  required 
  to 
  obtain 
  clear 
  fringes. 
  

  

  The 
  visibilities 
  given 
  are 
  uncorrected 
  eye 
  estimates, 
  but 
  the 
  

   results 
  are 
  so 
  decided 
  that 
  it 
  seems 
  worth 
  while 
  to 
  record 
  this 
  

   confirmation 
  of 
  Zeeman's 
  discovery. 
  

  

  The 
  writers 
  intend 
  to 
  carry 
  out 
  immediately 
  a 
  more 
  careful 
  

   set 
  of 
  measurements 
  along 
  this 
  line 
  and 
  hope 
  soon 
  to 
  be 
  able 
  

   to 
  communicate 
  a 
  more 
  accurate 
  set 
  of 
  results. 
  

  

  Physical 
  Laboratory, 
  

  

  University 
  of 
  Kansas, 
  April 
  15th, 
  1897. 
  

  

  May 
  10th, 
  1897. 
  

  

  Since 
  the 
  above 
  note 
  was 
  written 
  we 
  have 
  determined 
  the 
  

   amount 
  of 
  broadening 
  in 
  Angstrom 
  units 
  produced 
  by 
  various 
  

   magnetic 
  fields 
  of 
  measured 
  intensities. 
  Using 
  fields 
  ranging 
  

   from 
  to 
  7800 
  C. 
  G. 
  S. 
  units, 
  we 
  have 
  found 
  that 
  the 
  per- 
  

   centage 
  broadening 
  is 
  directly 
  proportional 
  to 
  the 
  field 
  strength 
  ; 
  

   the 
  absolute 
  amount 
  for 
  sodium 
  in 
  a 
  unit 
  field 
  is 
  ll 
  c 
  46xl0~ 
  6 
  

   Angstrom 
  units. 
  By 
  percentage 
  broadening 
  is 
  meant 
  the 
  

   increase 
  in 
  width 
  divided 
  by 
  the 
  original 
  width 
  of 
  the 
  line. 
  

  

  These 
  results 
  are 
  in 
  accord 
  with 
  the 
  electromagnetic 
  theory 
  

   of 
  Lorentz 
  as 
  given 
  by 
  Zeeman 
  (Phil. 
  Mag., 
  March, 
  1897). 
  

  

  