﻿130 
  Prof. 
  E. 
  H. 
  Barton 
  on 
  Range 
  and 
  

  

  Table 
  III. 
  

   Melde's 
  Experiment 
  with 
  Three 
  segments. 
  

  

  Frequencies 
  of 
  Forks 
  

  

  128 
  

  

  256 
  

  

  384 
  

  

  512 
  

  

  

  Loads 
  on 
  Silk 
  Line 
  (in 
  gras.) 
  ... 
  

  

  22 
  

  

  89 
  

  

  200 
  

  

  355 
  

  

  Extreme 
  Lengths 
  of 
  Line 
  for 
  

   Amplitudes 
  half 
  the 
  Maxima, 
  

   i. 
  e., 
  D— 
  V3 
  

  

  134-5 
  

   117 
  

  

  127-5 
  

   121 
  

  

  126 
  

   121 
  

  

  127 
  

   124 
  

  

  

  Differences 
  of 
  Lengths 
  

  

  175 
  

  

  60 
  

  

  5 
  

  

  3 
  

  

  

  Mistuniners: 
  M 
  — 
  

  

  0-139 
  

  

  0052 
  

  

  0-040 
  

  

  0-034 
  

  

  & 
  p 
  n 
  

  

  Sharpness 
  of 
  Resonance 
  : 
  

  

  ]l2-4 
  

  

  33 
  

  

  43 
  

  

  51 
  

  

  Theoretical 
  Values 
  of 
  H 
  for 
  

   £ 
  — 
  58 
  

  

  }H 
  

  

  28 
  

  

  42 
  

  

  56 
  

  

  

  Helmholtz' 
  s 
  Experiment. 
  — 
  The 
  responses 
  elicited 
  from 
  a 
  

   stretched 
  string 
  by 
  a 
  tuning-fork 
  are 
  pointed 
  out 
  by 
  

   Helmholtz, 
  and 
  this 
  experiment 
  may 
  be 
  fitly 
  named 
  after 
  

   him*. 
  

  

  For 
  the 
  purpose 
  of 
  investigating 
  the 
  sharpness 
  of 
  the 
  

   response 
  to 
  forks 
  of 
  different 
  pitches, 
  it 
  is 
  necessary 
  to 
  use 
  

   a 
  movable 
  bridge 
  under 
  the 
  string 
  of 
  the 
  monochord. 
  In 
  

   the 
  present 
  case 
  a 
  fine 
  steel 
  wire 
  (0*6 
  mm. 
  diam.) 
  was 
  used 
  

   as 
  the 
  musical 
  string 
  to 
  respond 
  to 
  the 
  forks 
  which 
  were 
  in 
  

   succession 
  placed 
  upright 
  with 
  the 
  stem 
  pressing 
  the 
  string- 
  

   on 
  to 
  the 
  movable 
  bridge. 
  To 
  show 
  the 
  response 
  to 
  an 
  

   audience, 
  riders 
  of 
  card 
  are 
  usually 
  placed 
  on 
  the 
  string. 
  

   The 
  vibration 
  then 
  leaves 
  in 
  position 
  the 
  riders 
  placed 
  at 
  

   nodes, 
  but 
  kicks 
  off 
  those 
  riders 
  occurring 
  at 
  the 
  intervening- 
  

   places 
  or 
  antinodes. 
  But 
  this 
  method 
  is 
  not 
  very 
  suitable 
  

   for 
  delicate 
  individual 
  trials. 
  Neither 
  does 
  listening 
  seem 
  

   the 
  best. 
  The 
  method 
  which, 
  for 
  delicacy 
  and 
  quickness, 
  

   appeared 
  most 
  satisfactory 
  is 
  that 
  of 
  lightly 
  touching 
  the 
  

   wire 
  at 
  an 
  antinode 
  with 
  the 
  tip 
  of 
  a 
  finger. 
  If 
  the 
  response 
  

  

  * 
  See 
  l 
  Tonempfindung-en, 
  &c.', 
  pp. 
  78-79, 
  Braunschweig, 
  I860; 
  or 
  

   ' 
  Sensations 
  of 
  Tone, 
  &c.\ 
  pp. 
  46-47, 
  London, 
  1895. 
  

  

  