﻿Charge 
  of 
  the 
  Ions 
  emitted 
  Ly 
  Hot 
  Bodies. 
  

  

  747 
  

  

  divided 
  into 
  twenty 
  parts, 
  so 
  that 
  fractions 
  of 
  a 
  turn 
  could 
  

   be 
  read 
  by 
  means 
  of 
  the 
  stationary 
  vertical 
  index 
  T', 
  sup- 
  

   ported 
  on 
  a 
  fixed 
  block. 
  The 
  whole 
  turns 
  were 
  registered 
  

  

  Fig. 
  2. 
  

  

  by 
  an 
  index 
  XT', 
  carried 
  by 
  a 
  cotton 
  thread 
  s, 
  wound 
  round 
  o, 
  

   and 
  made 
  to 
  pass 
  round 
  pulleys 
  VY 
  by 
  the 
  weight 
  W. 
  The 
  

   index 
  U' 
  travelled 
  over 
  a 
  scale 
  U 
  graduated 
  in 
  complete 
  

   turns 
  of 
  the 
  rod. 
  One 
  complete 
  turn 
  of 
  the 
  screw-head 
  

  

  