﻿Williams 
  — 
  Twist 
  in 
  Steel 
  and 
  Nickel 
  Rods. 
  557 
  

  

  Fig. 
  2. 
  

  

  E 
  Film 
  T 
  5 
  L 
  

  

  Film 
  T 
  3 
  

   Nickel 
  Eod, 
  No. 
  

  

  Film 
  T 
  4 
  

   Steel 
  Eod, 
  No. 
  2. 
  

  

  Am. 
  Jour. 
  Sci.— 
  Fourth 
  Series, 
  Vol. 
  XXXVI, 
  No. 
  215.— 
  Novembeb, 
  1913. 
  

  

  