﻿188 
  Mr. 
  E. 
  P. 
  Harrison 
  on 
  the 
  Temperature 
  Variation 
  of 
  

  

  E.M.F. 
  curve 
  makes 
  it 
  better 
  to 
  show 
  the 
  Peltier 
  coefficient- 
  

   variation 
  as 
  bits 
  of 
  straight 
  lines. 
  

  

  Fig. 
  6. 
  

  

  200 
  400 
  600 
  

  

  Scale 
  of 
  Temperature. 
  

  

  1000 
  

  

  Changes 
  in 
  sign 
  of 
  the 
  Thomson 
  coefficient, 
  or 
  specific 
  

   heat 
  of 
  electricity, 
  are 
  indicated 
  by 
  these 
  changes 
  in 
  slope 
  of 
  

   the 
  Peltier 
  coefficient, 
  and 
  the 
  former 
  are 
  remarked 
  on 
  by 
  

   Tait, 
  and 
  he 
  gives 
  the 
  temperatures 
  at 
  which 
  they 
  occur 
  as 
  

   just 
  above 
  200°. 
  and 
  again 
  just 
  below 
  300°. 
  It 
  is 
  also 
  

   evident 
  that 
  the 
  E.M.F. 
  curve 
  for 
  Ou-Ni 
  can 
  be 
  represented 
  

   very 
  well 
  by 
  bits 
  of 
  parabolas 
  over 
  the 
  whole 
  range. 
  

  

  Changes 
  in 
  E.M.F. 
  on 
  heating 
  above 
  900°. 
  

  

  It 
  was 
  noticed 
  that 
  changes 
  in 
  the 
  value 
  of 
  the 
  E.M.F. 
  

   for 
  any 
  particular 
  temperature 
  occurred 
  on 
  continued 
  heating,. 
  

  

  