﻿64 
  Mr. 
  W. 
  G. 
  Hormell 
  on 
  the 
  

  

  Position 
  of 
  Fourth 
  Node. 
  

  

  First 
  Set 
  of 
  Readings. 
  Second 
  Set 
  of 
  Headings. 
  

  

  121-90 
  122-10 
  

  

  121-45 
  121-60 
  

  

  122-05 
  122-30 
  

  

  122-00 
  121-70 
  

  

  122-05 
  122-30 
  

  

  121-65 
  122-00 
  

  

  122-10 
  122-05 
  

  

  122-05 
  122-30 
  

  

  122-40 
  121-80 
  

  

  122-15 
  122-50 
  

  

  121-99 
  122-07 
  

  

  122-07 
  

   121-99 
  

  

  122-03 
  

   39-24 
  

  

  82-79= 
  scale-reading 
  for 
  position 
  of 
  node. 
  

   •30 
  = 
  scale-correction. 
  

   • 
  90 
  = 
  bridge-correcti 
  on 
  . 
  

  

  3) 
  83-99 
  

  

  27*99 
  = 
  length 
  of 
  half-wave 
  in 
  paraffin. 
  

  

  _ 
  40 
  A 
  5 
  =,=1-46(1). 
  

  

  27-99 
  P 
  y 
  

  

  [40-857 
  

  

  By 
  a 
  very 
  simple 
  device 
  the 
  primary 
  of 
  the 
  oscillator 
  was 
  

   replaced 
  by 
  one 
  4 
  cm. 
  in 
  diameter, 
  and 
  under 
  this 
  was 
  placed 
  

   a 
  secondary 
  of 
  corresponding 
  diameter. 
  With 
  this 
  com- 
  

   bination 
  the 
  half-wave 
  in 
  air 
  was 
  30*66 
  cm. 
  With 
  a 
  3 
  cm. 
  

   primary 
  the 
  half-wave 
  in 
  air 
  was 
  20*85 
  cm. 
  By 
  a 
  happv 
  

   coincidence, 
  which 
  was 
  not 
  altogether 
  fortuitous, 
  the 
  columns 
  

   were 
  long 
  enough 
  to 
  contain 
  within 
  the 
  limit 
  of 
  error 
  three 
  

   half-waves 
  of 
  the 
  5-cm. 
  primary, 
  four 
  half-waves 
  of 
  the 
  4-cm. 
  

   primary, 
  and 
  six 
  half-waves 
  of 
  the 
  3-cm. 
  primary. 
  

  

  Table 
  VI. 
  exhibits 
  a 
  comparison 
  of 
  the 
  melting-points, 
  

   densities, 
  indices 
  of 
  refraction, 
  and 
  dielectric 
  constants 
  of 
  the 
  

   paraffins 
  and 
  the 
  two 
  kinds 
  of 
  oils 
  for 
  the 
  three 
  different 
  

   wave-lengths. 
  The 
  dielectric 
  constant 
  of 
  the 
  oils, 
  however, 
  

   was 
  determined 
  for 
  only 
  one 
  wave-length. 
  In 
  the 
  last 
  two 
  

   columns 
  will 
  be 
  found 
  the 
  light-index 
  of 
  refraction 
  for 
  the 
  

   D 
  1 
  line 
  and 
  the 
  corresponding 
  dielectric 
  constant. 
  A 
  com- 
  

   parison 
  of 
  the 
  dielectric 
  constants 
  for 
  any 
  given 
  substance 
  

  

  