﻿98 
  

  

  Ewell 
  — 
  Rotatory 
  Polarization 
  of 
  Light 
  in 
  

  

  original 
  natural 
  rotation. 
  Experiments 
  28, 
  29, 
  35, 
  88, 
  91, 
  94, 
  

   128 
  show 
  a 
  small 
  residual 
  rotation 
  after 
  a 
  large 
  twist, 
  but 
  

   experiments 
  84 
  and 
  86 
  do 
  not. 
  Observation 
  60 
  was 
  made 
  15 
  

   minutes 
  after 
  observation 
  59 
  ; 
  77, 
  2f 
  hours 
  after 
  76 
  ; 
  90, 
  2f 
  

   hours 
  after 
  89 
  ; 
  93, 
  48 
  hours 
  after 
  92 
  ; 
  127, 
  2i 
  hours 
  after 
  126 
  ; 
  

   the 
  torsion 
  having 
  been 
  kept 
  constant 
  during 
  these 
  intervals. 
  

   These 
  show 
  a 
  slight 
  decrease 
  in 
  the 
  rotation 
  if 
  the 
  twist 
  is 
  con- 
  

   tinued 
  for 
  some 
  time. 
  

  

  Fig. 
  3. 
  

  

  rs 
  tzj 
  -12° 
  

  

  izimulti 
  ^ 
  

  

  -10 
  

  

  i 
  70 
  ><' 
  

  

  _>- 
  o 
  

  

  -21° 
  ra 
  

  

  21° 
  ^ 
  

  

  o 
  

  

  'si 
  

  

  42° 
  r 
  

  

  63° 
  

  

  Experiments 
  with 
  Jelly 
  Tube 
  No. 
  14. 
  

  

  Table 
  IV. 
  

   Azimuths. 
  

  

  

  1 
  

  

  a 
  

  

  0" 
  1^ 
  10 
  

  

  

  

  

  

  -4-6 
  

  

  7r 
  

   3-6 
  

  

  TT 
  

  

  T 
  

  

  3-3 
  

  

  37r 
  

  

  TT 
  

  

  T 
  

  

  1-9 
  

  

  57r 
  

   8 
  

   1-8 
  

  

  37r 
  

  

  4 
  

  

  4-1 
  

  

  1ir 
  

  

  8 
  

  

  4-8 
  

  

  TT 
  

  

  39 
  

  

  97r 
  

  

  ~8~ 
  

  

  59 
  

  

  57r 
  

  

  4 
  

  

  4-8 
  

  

  llTT 
  

  

  8 
  

   39 
  

  

  3;r 
  

   2 
  

   3- 
  

  

  137r 
  

  

  8 
  

  

  T2 
  

  

  77r 
  157r 
  

   4 
  1 
  8 
  

   3-3! 
  4-7 
  

  

  Mean 
  

  

  

  -3°-7 
  

  

  -s 
  

  

  21 
  ^ 
  71 
  

   -21 
  Z 
  72 
  

  

  -6-8 
  

  

  4-7 
  

  

  4-3 
  

  

  3-6 
  

  

  1-3 
  

  

  1-1 
  

  

  2-9 
  

  

  5-2 
  

  

  61 
  

  

  6- 
  

  

  4- 
  

  

  4-6 
  

  

  4-9 
  

  

  3-2 
  

  

  4 
  9^ 
  6-3 
  

  

  -4-4 
  

  

  & 
  

  

  -24 
  

  

  1-4 
  

  

  1-3 
  

  

  1- 
  

  

  1-2 
  

  

  1-6 
  

  

  2-8 
  

  

  2-8 
  

  

  2 
  6 
  

  

  2-3 
  

  

  2-3 
  

  

  2-3 
  

  

  1-7 
  

  

  1-4 
  

  

  22 
  1-9 
  

  

  -1-95 
  

  

  -42 
  Z 
  73 
  

  

  102 
  

  

  11-3 
  

  

  lC-3 
  

  

  11- 
  

  

  10-2 
  

  

  131 
  

  

  11-8 
  

  

  10-3 
  

  

  9-7 
  

  

  8-4 
  

  

  101 
  

  

  11-2 
  

  

  9-7 
  

  

  13-4 
  

  

  11-2 
  13-2 
  

  

  10-9 
  

  

  

  42 
  S 
  74 
  

  

  —20 
  

  

  13.2 
  

  

  6-9 
  

  

  16 
  

  

  12-2i 
  4 
  9 
  

  

  4-9 
  

  

  20 
  

  

  21-8 
  

  

  131 
  

  

  8-7 
  

  

  13- 
  

  

  131 
  

  

  7-6 
  

  

  9 
  9 
  21-4 
  

  

  -13- 
  

  

  

  63 
  1 
  76 
  

  

  -45 
  

  

  45 
  

  

  41 
  

  

  44 
  

  

  43 
  j 
  46 
  

  

  45 
  

  

  47 
  

  

  48 
  

  

  39 
  

  

  49 
  

  

  42 
  

  

  37 
  

  

  39 
  

  

  48 
  47 
  

  

  -37-8 
  

  

  

  -63 
  ^ 
  76 
  

  

  41 
  

  

  38 
  

  

  41 
  

  

  37 
  

  

  35 
  i 
  34 
  

  

  41 
  

  

  42 
  

  

  37 
  

  

  38 
  

  

  43 
  

  

  41 
  

  

  35 
  

  

  41 
  

  

  39 
  1 
  41 
  

  

  39- 
  

  

  