﻿Media 
  Sitbjecied 
  to 
  Torsion. 
  

  

  93 
  

  

  I^umbers 
  without 
  the 
  negative 
  sign 
  are 
  always 
  positive. 
  

   The 
  positive 
  direction 
  of 
  twist 
  and 
  rotation 
  is 
  taken 
  through- 
  

   out 
  this 
  pajDer 
  as 
  the 
  direction 
  which 
  appears 
  counter-clock- 
  

   wise 
  to 
  one 
  looking 
  in 
  the 
  direction 
  of 
  propagation 
  of 
  the 
  ray 
  

   of 
  light. 
  

  

  Table 
  II. 
  

  

  Ezperiment 
  14. 
  

  

  Twisting 
  Moment 
  per 
  Centimeter 
  = 
  — 
  3150. 
  

  

  Azimuth 
  

  

  

  

  

  

  

  Mean 
  

  

  

  

  4-5 
  

  

  3-7 
  

  

  3-6 
  

  

  4-7 
  

  

  4-2 
  

  

  4-14 
  

  

  TT 
  

  

  •Y 
  

  

  1-8 
  

  

  3- 
  

  

  2-6 
  

  

  2-2 
  

  

  2-06 
  

  

  TT 
  

   ~2 
  

  

  2-6 
  

  

  2*2 
  

  

  1-2 
  

  

  •7 
  

  

  •8 
  

  

  1-50 
  

  

  4 
  

  

  7-2 
  

  

  8-0 
  

  

  7-6 
  

  

  8-2 
  

  

  8-7 
  

  

  7-94 
  

  

  TT 
  

  

  -1-7 
  

  

  1- 
  

  

  — 
  •7 
  

  

  -1-4 
  

  

  •3 
  

  

  -•48 
  

  

  

  8- 
  

  

  8-6 
  

  

  8-7 
  

  

  8-7 
  

  

  8-8 
  

  

  8-56 
  

  

  2 
  

  

  2-2 
  

  

  1-6 
  

  

  1 
  7 
  

  

  1-9 
  

  

  1-7 
  

  

  1-82 
  

  

  4 
  

  

  -3-9 
  

  

  — 
  4-8 
  

  

  — 
  4-4 
  

  

  -3-6 
  

  

  — 
  5- 
  

   Mean 
  

  

  -4-34 
  

  

  

  = 
  2-05 
  

  

  

  

  

  Experiment 
  16. 
  

  

  

  

  

  

  Twisting 
  Moment 
  per 
  

  

  Centimeter 
  = 
  

  

  = 
  3150. 
  

  

  

  Azimuth. 
  

  

  

  

  

  

  

  Mean 
  

  

  

  

  '/ 
  

  

  •8 
  

  

  1-1 
  

  

  —•1 
  

  

  1- 
  

  

  •74 
  

  

  TT 
  

  

  -6-1 
  

  

  — 
  5-1 
  

  

  — 
  4-1 
  

  

  -4-7 
  

  

  — 
  2-9 
  

  

  -4-58 
  

  

  TT 
  

  

  2 
  

  

  11-8 
  

  

  — 
  10-4 
  

  

  -11-2 
  

  

  -10-8 
  

  

  -9-8 
  

  

  -10-80 
  

  

  ~4 
  

  

  11-7 
  

  

  -11-7 
  

  

  — 
  11-3 
  

  

  -10-4 
  

  

  -9-8 
  

  

  --10-98 
  

  

  TT 
  

  

  -•2 
  

  

  •8 
  

  

  -•9 
  

  

  -]-8 
  

  

  -2-3 
  

  

  -•88 
  

  

  b-rr 
  

   4 
  

  

  -9'6 
  

  

  -8-7 
  

  

  -8- 
  

  

  -7- 
  

  

  -5-3 
  

  

  -7-92 
  

  

  "2 
  

  

  11- 
  

  

  — 
  10-3 
  

  

  -8-8 
  

  

  -8-6 
  

  

  -7-6 
  

  

  — 
  9-26 
  

  

  4 
  

  

  — 
  •8 
  

  

  — 
  3-2 
  

  

  — 
  2-1 
  

  

  -2-4 
  

  

  -1-8 
  

  

  -2-06 
  

  

  Mean 
  = 
  — 
  5^72 
  

  

  ^ 
  These 
  results, 
  excepting 
  those 
  of 
  the 
  last 
  experiment, 
  are 
  

   given 
  graphically 
  in 
  Fig. 
  1. 
  The 
  results 
  of 
  the 
  last 
  experi- 
  

   ment 
  are 
  uncertain 
  since 
  the 
  cylinder 
  broke 
  after 
  readings 
  had 
  

  

  