﻿98 
  

  

  Prof. 
  L. 
  R. 
  Ingerso]! 
  on 
  Magnetic 
  

   Table 
  Y. 
  

  

  Showing 
  effect 
  on 
  the 
  Kerr 
  rotation 
  of 
  overlaying 
  iron 
  

  

  surface 
  with 
  liquids 
  of 
  various 
  refractive 
  indices. 
  a 
  is 
  

  

  the 
  rotation 
  due 
  to 
  the 
  metal 
  surface 
  in 
  air, 
  and 
  /3 
  to 
  

   the 
  same 
  surface 
  overlaid 
  with 
  the 
  liquid. 
  

  

  a)^ 
  

  

  ^ith 
  Potass 
  

  

  ium 
  mercuric 
  iodide 
  solution. 
  

  

  N^l-72 
  

  

  Film. 
  

  

  Wave-length. 
  

  

  Rotation 
  a. 
  

  

  Rotation 
  fi. 
  

  

  /3/a. 
  

  

  Mean. 
  

  

  15 
  

  

  •84u 
  

   111 
  

   1-74 
  

  

  -•357° 
  

  

  -•420 
  

  

  -•463 
  

  

  -•651° 
  

  

  -•748 
  

   -•763 
  

  

  1^82 
  

   1-78 
  

   1-65 
  

  

  

  

  175 
  

  

  16 
  

  

  (similar 
  to 
  

  

  15). 
  

  

  . 
  -84/* 
  

   111 
  

   174 
  

  

  -•355° 
  

   -•435 
  

  

  -•480 
  

  

  -•659° 
  

  

  -•780 
  

  

  -•830 
  

  

  r85 
  

  

  1-79 
  

   173 
  

  

  179 
  

  

  29 
  

  

  (opaque) 
  

  

  •67/i 
  

   •82 
  

   1^07 
  

   169 
  

  

  -•388° 
  

   -•403 
  

   -•378 
  

   -•245 
  

  

  -•704° 
  

   -•691 
  

   -•632 
  

   -•399 
  

  

  1-81 
  

   1-71 
  

   1-67 
  

   1-63 
  

  

  1-71 
  

  

  

  (2) 
  With 
  Bromnapthalin. 
  N^^ 
  

  

  1-66. 
  

  

  

  15 
  

  

  •84/1 
  

   110 
  

   174 
  

  

  -•357° 
  

  

  -•420 
  

  

  -•462 
  

  

  -•630° 
  

  

  -•698 
  

  

  -•737 
  

  

  176 
  

   1-66 
  

   1-59 
  

  

  

  

  1-67 
  

  

  

  (3) 
  With 
  Canada 
  balsam. 
  N^ 
  

  

  1-55. 
  

  

  

  ]5 
  

  

  110 
  

  

  r74 
  

  

  -•357° 
  

  

  -•4^_0 
  

  

  -•462 
  

  

  -•593° 
  

  

  -•686 
  

  

  -•753 
  

  

  166 
  

   1^63 
  

   1^63 
  

  

  

  ■" 
  " 
  • 
  

  

  164 
  

  

  Polished 
  

   steel. 
  

  

  •84/i 
  

   1-41 
  

   196 
  

  

  -•385° 
  

  

  -•b40 
  

  

  -•261 
  

  

  -•504° 
  

  

  -•452 
  

  

  -•365 
  

  

  1-31 
  

   133 
  

   1-40 
  

  

  1-35 
  

  

  

  (4) 
  AVith 
  Glycerine. 
  N^ 
  1-45. 
  

  

  

  

  ]5 
  

  

  . 
  •84/i 
  

   111 
  

   1-74 
  

  

  -•357° 
  

  

  -•420 
  

  

  -•462 
  

  

  -•556° 
  

  

  -•630 
  

  

  -•670 
  

  

  1^56 
  

   1^50 
  

   1-45 
  

  

  

  

  150 
  

  

  29 
  

  

  •67u 
  

   •82 
  

   107 
  

   1-69 
  

  

  -•388° 
  

   -•403 
  

   -•378 
  

   -•245 
  

  

  -•596° 
  

   -•617 
  

   -•557 
  

   -•364 
  

  

  153 
  

   1-53 
  

   r47 
  

  

  1-48 
  

  

  150 
  

  

  Polished 
  

   steel. 
  

  

  •S4/t 
  

  

  r4i 
  

  

  196 
  

  

  -•385° 
  

  

  -•340 
  

  

  -•261 
  

  

  —534° 
  

  

  -•484 
  

  

  -•379 
  

  

  139 
  

   1-42 
  

   1-45 
  

  

  142 
  

  

  

  (5) 
  With 
  Water. 
  

  

  Nj, 
  1-33. 
  

  

  

  

  16 
  

  

  •84,u 
  

   1 
  11 
  

   1-74 
  

  

  -•355° 
  

  

  -•435 
  

  

  -•480 
  

  

  -•438° 
  

  

  -•523 
  

  

  -.•567 
  

  

  r23 
  

   1-20 
  

  

  118 
  

  

  1-20 
  

  

  