﻿472 
  

  

  Duns 
  tan, 
  Rice 
  and 
  Kraus- 
  

  

  ■Sodium 
  Lines, 
  etc. 
  

  

  Art. 
  L. 
  — 
  Preliminary 
  Note 
  on 
  the 
  Broadening 
  of 
  the 
  Sodium 
  

   Lines 
  by 
  Lntense 
  Magnetic 
  Fields 
  / 
  by 
  A. 
  StC. 
  Dunstan, 
  

   M. 
  E. 
  Eice 
  and 
  C. 
  A. 
  Kraus. 
  

  

  Dr. 
  P. 
  Zeeman 
  (Phil. 
  Mag., 
  March, 
  1897), 
  using 
  as 
  a 
  source 
  

   of 
  light 
  a 
  Bunsen 
  flame 
  between 
  the 
  poles 
  of 
  an 
  electromagnet, 
  

   has 
  shown 
  that 
  the 
  sodium 
  lines 
  are 
  broadened 
  by 
  the 
  influence 
  

   of 
  an 
  intense 
  magnetic 
  field. 
  To 
  obtain 
  the 
  necessary 
  disper- 
  

   sion 
  he 
  used 
  a 
  large 
  concave 
  grating. 
  

  

  It 
  occurred 
  to 
  the 
  writers 
  that 
  the 
  interferometer 
  invented 
  

   by 
  Michelson 
  of 
  Chicago 
  University, 
  being 
  far 
  more 
  powerful 
  

   than 
  a 
  grating 
  for 
  the 
  purpose 
  of 
  analyzing 
  a 
  single 
  line 
  in 
  the 
  

   spectrum, 
  ought 
  to 
  show 
  the 
  effect 
  of 
  magnetic 
  influence 
  more 
  

   decidedly. 
  

  

  For 
  this 
  purpose 
  the 
  apparatus 
  was 
  arranged 
  as 
  shown 
  in 
  

  

  ^ 
  

  

  5 
  

  

  $ 
  

  

  fig. 
  1. 
  The 
  light 
  was 
  furnished 
  by 
  a 
  Bunsen 
  flame 
  A, 
  placed 
  

   between 
  the 
  poles 
  of 
  a 
  powerful 
  electromagnet 
  B. 
  

  

  A 
  piece 
  of 
  asbestos 
  saturated 
  with 
  JSfaOH 
  solution 
  was 
  

   wrapped 
  around 
  the 
  burner 
  at 
  the 
  top. 
  The 
  light 
  is 
  rendered 
  

   slightly 
  convergent 
  by 
  the 
  lens 
  C 
  and 
  falls 
  upon 
  the 
  semi- 
  

  

  