﻿592 
  Prof. 
  Pollock 
  and 
  Mr. 
  Vonwiller 
  : 
  Experiments 
  

  

  are 
  small 
  odd 
  numbers, 
  then 
  the 
  ratio 
  of 
  2(M— 
  a 
  + 
  C)+Zto 
  

   2{a 
  + 
  c) 
  + 
  l 
  is 
  to 
  be 
  equal 
  to 
  m/n. 
  Ten 
  such 
  equations 
  have 
  

   been 
  formed 
  from 
  the 
  results 
  of 
  experiments 
  with 
  various 
  

   lengths 
  of 
  wires. 
  The 
  main 
  values 
  of 
  C 
  and 
  c 
  found 
  from 
  these 
  

   equations 
  are 
  C 
  = 
  l*52 
  metres, 
  c 
  = 
  0*11 
  metre. 
  + 
  0=1*63, 
  

   the 
  value 
  which 
  has 
  been 
  used 
  in 
  Table 
  I. 
  These 
  corrections 
  

   apply 
  to 
  all 
  the 
  experiments. 
  

  

  With 
  the 
  bridge 
  in 
  a 
  fixed 
  position, 
  the 
  magnitude 
  of 
  the 
  

   readings 
  obtained 
  with 
  the 
  detector 
  depend 
  on 
  the 
  period 
  of 
  

   ihe 
  oscillation 
  of 
  the 
  condenser 
  circuit, 
  and 
  also 
  on 
  the 
  length 
  

   of 
  the 
  spark-gap. 
  Keeping 
  the 
  latter 
  constant, 
  the 
  curve 
  in 
  

   fig. 
  3, 
  freely 
  drawn 
  through 
  the 
  observations, 
  gives 
  the 
  rela- 
  

   tions 
  between 
  the 
  deflexions 
  as 
  ordinates 
  and 
  the 
  distance 
  

  

  Fig. 
  3. 
  

  

  l 
  £ 
  3 
  cms. 
  

  

  between 
  the 
  condenser-plates 
  as 
  abscissas, 
  both 
  measured 
  in 
  

   centimetres. 
  The 
  wires 
  in 
  this 
  experiment 
  were 
  13*62 
  metres 
  

   long, 
  uncorrected, 
  and 
  the 
  bridge 
  was 
  placed 
  at 
  2*33 
  m. 
  

   from 
  their 
  free 
  ends. 
  

  

  