﻿296 
  Messrs. 
  Spiers, 
  Twyman, 
  and 
  Waters 
  on 
  Variations 
  in 
  

  

  Fig. 
  6. 
  — 
  Curves 
  connecting 
  E.M.F. 
  and 
  Temperature 
  ; 
  Rate 
  of 
  Change 
  

   of 
  Temperature 
  1° 
  in 
  30 
  minutes. 
  

  

  16 
  

  

  17 
  18 
  19 
  

  

  Temperature 
  in 
  degrees 
  Centigrade. 
  

  

  