﻿Positive 
  Ions 
  emitted 
  from 
  various 
  Hot 
  Bodies, 
  657 
  

  

  gave 
  1030 
  degrees 
  absolute 
  and 
  the 
  resistance 
  method 
  gave 
  

   973 
  degrees. 
  For 
  the 
  higher 
  temperature 
  the 
  optical 
  method 
  

   gave 
  1190 
  degrees 
  and 
  the 
  resistance 
  method 
  gave 
  1163 
  

   degrees 
  absolute. 
  In 
  each 
  case 
  the 
  mean 
  of 
  the 
  values 
  by 
  

   the 
  two 
  methods 
  was 
  used 
  in 
  the 
  calculation 
  o£ 
  the 
  gas 
  

   constant 
  R. 
  These 
  determinations 
  of 
  the 
  temperature 
  are 
  

   probably 
  subject 
  to 
  less 
  percentage 
  error 
  than 
  that 
  which 
  

   might 
  be 
  expected 
  to 
  arise 
  from 
  the 
  plane 
  of 
  the 
  thermionic 
  

   radiator 
  not 
  being 
  in 
  the 
  plane 
  of 
  the 
  disk. 
  

  

  Fk. 
  3. 
  

  

  140 
  

  

  \EQ 
  

  

  100 
  

  

  ■80 
  

  

  £0 
  

  

  40 
  

  

  £0 
  

  

  

  ■ 
  

  

  

  

  

  \, 
  

  

  Go 
  

  

  LD 
  

  

  

  

  \\ 
  

  

  

  

  

  

  ^ 
  

  

  \ 
  

  

  

  

  

  \ 
  

  

  \X, 
  

  

  

  

  

  \ 
  

  

  \ 
  

  

  \ 
  

  

  

  

  ^\ 
  

  

  \ 
  

  

  \\ 
  

  

  

  

  \\ 
  

  

  

  

  \ 
  

  

  

  \\ 
  

  

  

  \ 
  

  

  \ 
  \ 
  

  

  

  \ 
  

  

  \ 
  

  

  

  

  \ 
  

  

  N 
  

  

  

  9^ 
  

  

  \ 
  

  

  \ 
  

  

  

  ^ 
  

  

  

  

  

  FOTENTML 
  - 
  l/OLTS 
  

  

  From 
  the 
  data 
  given 
  in 
  the 
  table 
  were 
  plotted 
  curves 
  

   1 
  and 
  2 
  (fig. 
  3) 
  showing 
  the 
  values 
  of 
  the 
  current 
  for 
  different 
  

  

  