﻿Thermal 
  Expansion 
  of 
  Porcelain. 
  

  

  641 
  

  

  larger 
  between 
  0° 
  and 
  100° 
  than 
  at 
  the 
  higher 
  temperatures 
  

   explored 
  by 
  Bedford. 
  Two 
  entirely 
  independent 
  series 
  of 
  

  

  Fig. 
  2. 
  — 
  Lengths 
  at 
  t° 
  when 
  Lo°=l. 
  

  

  425 
  

   1-000 
  400 
  

  

  375 
  

   1-000 
  350 
  

  

  325 
  

   1-000 
  300 
  

  

  275 
  

   1-000 
  250 
  

  

  225 
  

   1-000 
  200 
  

  

  175 
  

   1-000 
  150 
  

  

  125 
  

  

  1-000 
  100 
  

  

  75 
  

  

  1-000050 
  

  

  25 
  

   1-000 
  000 
  

  

  r- 
  

  

  A 
  

  

  / 
  

  

  0° 
  10° 
  20° 
  30° 
  40° 
  50° 
  60° 
  70° 
  80° 
  90° 
  100° 
  110° 
  120° 
  

  

  determinations, 
  carried 
  out 
  by 
  the 
  highly 
  accurate 
  inter- 
  

   ference 
  method, 
  and 
  employing 
  the 
  quite 
  different 
  forms 
  of 
  

   apparatus 
  of 
  Fizeau 
  and 
  the 
  author, 
  involving 
  also 
  the 
  use 
  of 
  

   light 
  of 
  entirely 
  different 
  wave-lengths, 
  have 
  now 
  conclusively 
  

   settled 
  the 
  rate 
  of 
  expansion 
  for 
  the 
  short 
  interval 
  of 
  0° 
  to 
  

   100°, 
  and, 
  indeed, 
  if 
  the 
  author's 
  higher 
  limit 
  is 
  included, 
  

   for 
  the 
  interval 
  0° 
  to 
  120°. 
  The 
  temperature 
  of 
  120° 
  herein 
  

  

  