﻿Properties 
  of 
  Films 
  of 
  Magnetic 
  Metals. 
  847 
  

  

  Table 
  V. 
  — 
  Electrolytic 
  Iron. 
  

   Thickness 
  : 
  No. 
  24, 
  35xl0~ 
  7 
  ; 
  No. 
  26, 
  41*5 
  x 
  10" 
  7 
  cm. 
  

  

  

  No. 
  

  

  24— 
  Field, 
  14,700. 
  

  

  No. 
  26- 
  Field, 
  14,600. 
  

  

  Wave- 
  

   length. 
  

  

  

  

  

  

  

  

  Rotat. 
  

  

  Compens. 
  

  

  Ellipt. 
  

  

  Eotat. 
  

  

  Compens. 
  

  

  Ellipt. 
  

  

  

  (deg.). 
  

  

  (deg.). 
  

  

  X 
  iu 
  3 
  . 
  

  

  (deg.)- 
  

  

  (deg.). 
  

  

  X103. 
  

  

  440... 
  

  

  •57 
  

  

  56 
  

  

  133 
  

  

  •66 
  

  

  6-4 
  

  

  15*5 
  

  

  460... 
  

  

  •61 
  

  

  

  

  

  

  

  480... 
  

  

  •65 
  

  

  62 
  

  

  13-6 
  

  

  •78 
  

  

  7-3 
  

  

  16-2 
  

  

  500 
  ... 
  

  

  •70 
  

  

  

  

  

  

  •• 
  

  

  520... 
  

  

  •78 
  

  

  7-i 
  

  

  14-4 
  

  

  •91 
  

  

  8 
  3 
  

  

  17-0 
  

  

  540... 
  

  

  •81 
  

  

  

  

  

  

  

  560... 
  

  

  •89 
  

  

  7-8 
  

  

  15-0 
  

  

  1-04 
  

  

  92 
  

  

  17-5 
  

  

  600... 
  

  

  •98 
  

  

  8-3 
  

  

  151 
  

  

  1-20 
  

  

  94 
  

  

  16-9 
  

  

  630... 
  

  

  1-05 
  

  

  8-5 
  

  

  14-7 
  

  

  1-29 
  

  

  94 
  

  

  16-2 
  

  

  660 
  ... 
  

  

  1-07 
  

  

  8-6 
  

  

  14-3 
  

  

  1-27 
  

  

  9-3 
  

  

  15-2 
  

  

  rotation 
  curve 
  is 
  practically 
  the 
  same 
  in 
  both, 
  but 
  there 
  is 
  an 
  

   evident 
  difference 
  in 
  the 
  ellipticity, 
  which 
  indicates 
  that 
  the 
  

   metal 
  giving 
  the 
  upper 
  curve 
  has 
  the 
  centre 
  of 
  its 
  resonance 
  

   region 
  slightly 
  nearer 
  the 
  visible 
  spectrum 
  than 
  the 
  other. 
  

   Both 
  indicate 
  the 
  resonance 
  region 
  o£ 
  electrolytic 
  iron 
  as 
  

   being 
  much 
  further 
  out 
  in 
  the 
  violet 
  than 
  that 
  of 
  dark 
  iron. 
  

  

  The 
  values 
  of 
  rotation 
  and 
  ellipticity 
  divided 
  by 
  the 
  thick- 
  

   ness 
  of 
  the 
  corresponding 
  films 
  are 
  given 
  in 
  Table 
  VI., 
  and 
  

  

  Table 
  VI. 
  — 
  Electrolytic 
  Iron. 
  

   Field, 
  14,600 
  c.G.s. 
  

  

  Wave- 
  

   length. 
  

  

  Rotation 
  , 
  jx— 
  3 
  

  

  Thickness' 
  

  

  No. 
  24. 
  

  

  440 
  ... 
  

  

  163 
  

  

  460 
  ... 
  

  

  174 
  

  

  480 
  ... 
  

  

  189 
  

  

  500 
  ... 
  

  

  199 
  

  

  520 
  ... 
  

  

  221 
  

  

  540 
  ... 
  

  

  230 
  

  

  560 
  ... 
  

  

  254 
  

  

  580 
  ... 
  

  

  270 
  

  

  600 
  ... 
  

  

  280 
  

  

  620 
  ... 
  

  

  

  630 
  ... 
  

  

  299 
  

  

  640 
  ... 
  

  

  

  660 
  ... 
  

  

  306 
  

  

  No. 
  26. 
  

  

  159 
  

   187 
  

   219 
  

   249 
  

   288 
  

   310 
  

   305 
  

  

  Ellipticity 
  

   Thickness' 
  

  

  No. 
  24. 
  

  

  3820 
  

   3880 
  

   4140 
  

   4300 
  

   4330 
  

   4230 
  

   4070 
  

  

  No. 
  26. 
  

  

  3740 
  

   3920 
  

   4080 
  

   4220 
  

   4100 
  

   3920 
  

   3660 
  

  

  Extinction. 
  

  

  xio~ 
  5 
  . 
  

  

  8-1 
  

   7"5 
  

   7-0 
  

   65 
  

   6-3 
  

   63 
  

   61 
  

   6-0 
  

  

  6-2 
  

  

  6-0 
  

  

  