﻿Energy 
  of 
  Negative 
  Electrons 
  emitted 
  by 
  Hot 
  Bodies. 
  359 
  

  

  Experimental 
  Arrangements. 
  

  

  The 
  general 
  arrangements 
  of 
  the 
  apparatus 
  used 
  to 
  inves- 
  

   tigate 
  the 
  kinetic 
  energy 
  o£ 
  the 
  negative 
  ions 
  from 
  hot 
  

   platinum 
  is 
  shown 
  diagrammatically 
  in 
  fig. 
  1. 
  The 
  central 
  

  

  Fur. 
  1. 
  

  

  o~4— 
  > 
  

  

  IN 
  

  

  VVVXAAAA/WVVWWWVVV 
  

  

  L 
  2 
  JZ 
  

  

  ril 
  — 
  lh 
  r^AAAA/VWV 
  

  

  EARTH 
  

  

  Earth 
  

  

  portion 
  of 
  a 
  narrow 
  platinum 
  strip 
  H 
  was 
  bent 
  upwards 
  as 
  

   shown 
  through 
  a 
  square 
  hole 
  at 
  the 
  centre 
  of 
  the 
  lower 
  of 
  

   two 
  circular 
  plates, 
  so 
  as 
  to 
  be 
  flush 
  with 
  the 
  upper 
  surface 
  

   of 
  the 
  latter. 
  The 
  upper 
  plate 
  U 
  was 
  somewhat 
  smaller 
  than 
  

   the 
  lower, 
  and 
  was 
  surrounded 
  by 
  a 
  guard-ring 
  G. 
  Both 
  

   plates 
  were 
  perpendicular 
  to 
  the 
  common 
  axis 
  passing 
  through 
  

   their 
  centres. 
  The 
  upper 
  plate 
  was 
  connected 
  to 
  one 
  pair 
  of 
  

   the 
  quadrants 
  of 
  a 
  Dolazalek 
  electrometer 
  by 
  means 
  of 
  the 
  

   key 
  &i&2- 
  The 
  plug 
  Je 
  2 
  was 
  connected 
  with 
  the 
  guard-ring 
  

   and 
  with 
  the 
  second 
  pair 
  of 
  quadrants. 
  By 
  means 
  of 
  the 
  

   key 
  b 
  it 
  could 
  be 
  connected 
  either 
  with 
  the 
  earth 
  or 
  any 
  

  

  