﻿4:6S 
  

  

  Mr. 
  L. 
  Vegard 
  o?i 
  the 
  Electric 
  Discliarge 
  

  

  The 
  current 
  was 
  measured 
  with 
  a 
  d''Arsonval 
  galvanometer 
  

   (G) 
  put 
  as 
  a 
  shunt 
  to 
  the 
  head 
  circuit. 
  In 
  order 
  to 
  vary 
  the 
  

  

  Fio-. 
  3. 
  

  

  current 
  and 
  in 
  order 
  to 
  keep 
  it 
  constant 
  during 
  the 
  discharge, 
  

   a 
  series 
  of 
  high 
  resistances 
  had 
  to 
  be 
  used. 
  The 
  resistances 
  

   used 
  consisted 
  o£ 
  a 
  number 
  of 
  U-shaped 
  glass 
  tubes 
  filled 
  

   with 
  a 
  solution 
  of 
  cadmium 
  iodide 
  in 
  amyl 
  alcohol 
  (fig. 
  3, 
  R), 
  

   and 
  with 
  resistances 
  varying 
  from 
  about 
  ^ 
  to 
  30 
  megohm. 
  

  

  The 
  large 
  resistances 
  (ri, 
  r^ 
  were 
  put 
  into 
  the 
  electro- 
  

   meter 
  connexions 
  to 
  avoid 
  any 
  short 
  circuit 
  through 
  the 
  

   electrometer. 
  

  

  The 
  whole 
  system 
  was 
  insulated, 
  only 
  at 
  one 
  point 
  the 
  

   circuit 
  was 
  put 
  to 
  earth 
  through 
  a 
  very 
  big 
  resistance 
  so 
  as 
  

   to 
  fix 
  the 
  zero 
  point 
  of 
  the 
  potential 
  ; 
  for 
  if 
  the 
  explorers 
  

   require 
  some 
  time 
  to 
  take 
  up 
  the 
  surrounding 
  potential, 
  

   fluctuations 
  in 
  the 
  absolute 
  value 
  of 
  the 
  potential 
  in 
  the 
  

   circuit 
  might 
  cause 
  unsteadiness 
  and 
  faults 
  in 
  the 
  deter- 
  

   mination 
  of 
  the 
  P.D. 
  

  

  