﻿Dielectric 
  Constant 
  of 
  Paraffins. 
  

  

  59 
  

  

  Table 
  II. 
  shows 
  the 
  results 
  of 
  this 
  experiment. 
  It 
  will 
  be 
  

   observed 
  that 
  as 
  the 
  distance 
  between 
  the 
  coils 
  increases 
  the 
  

   wave-length 
  decreases, 
  showing 
  that 
  a 
  decrease 
  in 
  the 
  capacity 
  

   and 
  mutual 
  induction 
  of 
  the 
  system 
  decreases 
  the 
  period 
  of 
  

   oscillation. 
  

  

  (c) 
  Determination 
  of 
  the 
  Relative 
  Velocities 
  of 
  Electrical 
  

  

  Waves 
  along 
  Magnetic 
  and 
  Non-Magnetic 
  Wires 
  of 
  

  

  Different 
  Diameters. 
  

  

  In 
  this 
  experiment 
  the 
  coils 
  were 
  5 
  cm. 
  in 
  diameter, 
  and 
  

  

  the 
  length 
  of 
  the 
  secondary 
  was 
  48*5 
  cm. 
  The 
  coils 
  were 
  

  

  kept 
  at 
  the 
  same 
  distance, 
  and 
  the 
  Lecher 
  wires 
  were 
  changed. 
  

  

  Table 
  III. 
  

  

  Kind 
  of 
  Wire. 
  

  

  Diameter 
  of 
  Corrected 
  

   Wire. 
  Wave-length. 
  

  

  Copper 
  

  

  millim. 
  

   1-00 
  

   2-00 
  

   3-40 
  

   1-00 
  

   1-25 
  

   1-80 
  

   260 
  

   1-00 
  

   0-93 
  

   1-00 
  

   1-00 
  

  

  centim. 
  

   81-52 
  

  

  80-84 
  

   80-80 
  

   81-70 
  

   81-56 
  

   80-36 
  

   80-86 
  

   81-08 
  

   80-90 
  

   80-88 
  

   81-10 
  

  

  

  

  Iron 
  

  

  

  " 
  

  

  " 
  

  

  

  Nickel 
  

  

  German-silver 
  

  

  

  Copper 
  

  

  Secondary 
  

  

  100 
  

   1-00 
  

  

  79-26 
  

   79-44 
  

  

  Iron 
  

  

  Secondary 
  

  

  

  Table 
  III. 
  shows 
  the 
  final 
  results. 
  The 
  last 
  two 
  sets 
  of 
  

   readings 
  show 
  the 
  comparison 
  of 
  waves 
  produced 
  when 
  the 
  

   Lecher 
  wires 
  were 
  kept 
  constant 
  and 
  the 
  secondary 
  of 
  the 
  

   Blondlot 
  oscillator 
  changed. 
  In 
  the 
  first 
  case 
  the 
  secondary 
  

   was 
  made 
  of 
  copper 
  wire, 
  and 
  in 
  the 
  second 
  it 
  was 
  made 
  of 
  

   iron. 
  Great 
  care 
  was 
  taken 
  to 
  make 
  the 
  two 
  secondaries 
  of 
  

   the 
  same 
  size 
  and 
  shape, 
  and 
  to 
  keep 
  the 
  primary 
  and 
  

   secondary 
  the 
  same 
  distance 
  apart 
  in 
  both 
  cases. 
  

  

  Allowing 
  less 
  than 
  1 
  per 
  cent, 
  for 
  error 
  of 
  observation, 
  

   it 
  is 
  readily 
  seen 
  that 
  the 
  wave-lengths 
  for 
  different 
  kinds 
  of 
  

   wires 
  are 
  practically 
  the 
  same. 
  One 
  concludes 
  from 
  these 
  

   observations 
  that 
  conductors 
  offer 
  no 
  resistance 
  to 
  the 
  passage 
  

  

  