﻿842 
  

  

  Prof. 
  R. 
  W. 
  Wood 
  on 
  Resonance 
  

  

  the 
  groups 
  o£ 
  order 
  0, 
  1. 
  3, 
  and 
  5 
  are 
  almost 
  identical 
  in 
  appear- 
  

   ance. 
  At 
  the 
  bottom 
  of 
  fig. 
  2 
  (p. 
  834) 
  I 
  have 
  given 
  a 
  diagram 
  

   of 
  the 
  groups 
  of 
  higher 
  order 
  than 
  the 
  6th, 
  for 
  the 
  101 
  volt 
  

   excitation. 
  We 
  see 
  that 
  the 
  groups 
  of 
  sharp 
  lines 
  (8, 
  10, 
  

   12 
  and 
  13) 
  have 
  the 
  companion 
  lines 
  arranged 
  differently. 
  

   In 
  group 
  8, 
  for 
  example, 
  the 
  spacing 
  of 
  the 
  triplet 
  to 
  the 
  left 
  

   of 
  the 
  strong 
  central 
  triplet 
  is 
  very 
  different 
  from 
  that 
  which 
  

   obtains 
  in 
  the 
  groups 
  of 
  lower 
  order, 
  and 
  I 
  feel 
  very 
  certain 
  

   that 
  the 
  line 
  of 
  shortest 
  wave-length 
  in 
  this 
  group 
  corre- 
  

   sponds 
  to 
  line 
  No. 
  2 
  of 
  the 
  lower 
  order 
  groups. 
  This 
  

   distortion 
  of 
  the 
  groups 
  as 
  we 
  ascend 
  the 
  spectrum 
  is, 
  of 
  

   course, 
  due 
  to 
  the 
  fact 
  that 
  the 
  companion 
  lines 
  are 
  differently 
  

   placed 
  with 
  respect 
  to 
  the 
  core 
  line. 
  

  

  Wave-lengths 
  excited 
  by 
  Hg 
  Line 
  5460*7 
  

  

  -2 
  Order. 
  

   5334-45 
  1 
  

   5336-85 
  1 
  

  

  -1 
  Order. 
  

  

  5395-83 
  2 
  

   5398-22 
  3 
  

   540011 
  2 
  

  

  Order. 
  

  

  5455-16 
  3 
  

   5456-00 
  4 
  

   5457-34 
  4 
  

   5459-58 
  8 
  

   5460-74 
  10 
  Hg 
  

   5462-32 
  8 
  

   5464-35 
  2 
  

   546660 
  4 
  

  

  1 
  Order. 
  

  

  1 
  5518-76 
  

  

  2 
  5519-69 
  

  

  3 
  5521-32 
  

   . 
  t 
  5523 
  56 
  

   * 
  1 
  5523-78 
  

  

  5524-67 
  

  

  5 
  5524-94 
  

   5525-12 
  

   5525-20 
  

  

  6 
  552652 
  

   5527-15 
  

  

  7 
  5528-52 
  

   9 
  5530-38 
  

  

  2 
  Order. 
  

  

  5583-0 
  1 
  

   55851 
  1 
  

   5587-4 
  2 
  

   5589-4 
  3 
  

   5591-8 
  2 
  

  

  3 
  Order. 
  

  

  1 
  5649-30 
  i 
  

  

  2 
  5650-87 
  '< 
  

  

  3 
  5652-88 
  

   . 
  f 
  5655-75 
  

   * 
  I 
  5655-97 
  

   - 
  f 
  5657-06 
  

   ° 
  1 
  5657-38 
  

  

  6 
  5658-76 
  

  

  7 
  5660-50 
  

  

  5661-40 
  2 
  

  

  4 
  Order. 
  

  

  5715-25 
  1 
  

   5718-14 
  2 
  

   5720-10 
  3 
  

   5720-45 
  3 
  

   5723-25 
  4 
  

   5724-85 
  4 
  

   5726-45 
  3 
  

  

  5 
  Order. 
  

  

  5785-1 
  2 
  

   5786-7 
  3 
  

   5789 
  6 
  4 
  

   5793-3 
  8 
  

   5794-2 
  8 
  

   5796 
  3 
  5 
  

   5797-4 
  5 
  

  

  6 
  Order. 
  

  

  L 
  5858-3 
  1 
  

   5860-7 
  1 
  

   5864-4 
  4 
  

   5865-7 
  6 
  

   5867-5 
  3 
  

  

  7 
  Order. 
  

  

  5927-06 
  1 
  

   593396 
  2 
  

   5940-86 
  1 
  

  

  8 
  Order. 
  

  

  ! 
  6000-86 
  3 
  

   6004-15 
  3 
  

   6006-36 
  3 
  

   : 
  6008-86 
  6 
  

   i 
  6010-26 
  8 
  

   i 
  601211 
  6 
  

  

  9 
  Order. 
  

   Missing. 
  

  

  10 
  Order. 
  

  

  ! 
  6149-66 
  3 
  

   6153-41 
  2 
  

   6155 
  39 
  2 
  

   615901 
  5 
  

   6160-46 
  8 
  

   6162-26 
  5 
  

  

  11 
  Order. 
  

  

  6228-56 
  1 
  

   6231-06 
  1 
  

   6234-0 
  1 
  

   6235-96 
  3 
  

   6237-36 
  6 
  

   6239-16 
  4 
  

  

  12 
  Order. 
  

  

  6310 
  1 
  

   6314-36 
  1 
  

   6315-96 
  2 
  

   6317-26 
  1 
  

  

  13 
  Order. 
  

  

  6388-11 
  2 
  

   6394-28 
  2 
  

   6395-86 
  4 
  

   6397-76 
  3 
  

  

  14 
  Order. 
  

   Missing. 
  

  

  15 
  Order. 
  

  

  6559-61 
  2 
  

   6560-86 
  3 
  

   6562-66 
  2 
  

  

  