﻿1875.] 
  

  

  Electric 
  Conductivity 
  of 
  Glass. 
  

  

  471 
  

  

  The 
  rapidities 
  of 
  loss 
  are 
  obtained 
  by 
  dividing 
  the 
  Napierian 
  logarithm 
  

   of 
  the 
  quotient 
  of 
  two 
  charges 
  or 
  readings 
  by 
  the 
  interval 
  in 
  minutes 
  

   between 
  the 
  two 
  observations. 
  Thus 
  it 
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  roughly 
  assumed 
  that 
  the 
  

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  of 
  the 
  jar 
  is 
  the 
  same 
  at 
  all 
  temperatures. 
  

  

  1 
  

  

  Time. 
  

  

  Temp. 
  P. 
  

  

  "Rpa 
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  1 
  20 
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  40 
  

   45 
  

  

  94 
  

   98 
  

  

  1154 
  

   1149 
  

  

  0-0023 
  

  

  j» 
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