﻿316 
  Prof. 
  L. 
  T. 
  More 
  on 
  the 
  Localization 
  

  

  limited 
  degree 
  when 
  the 
  sound 
  was 
  made 
  on 
  her 
  right, 
  but 
  

   she 
  was 
  quite 
  in 
  error 
  for 
  sounds 
  from 
  the 
  medial 
  plane 
  or 
  

   from 
  the 
  left. 
  This 
  inaccurate 
  power 
  of 
  determining 
  direc- 
  

   tion 
  I 
  attribute 
  entirely 
  to 
  changes 
  in 
  loudness. 
  If 
  the 
  fork 
  

   was 
  held 
  well 
  to 
  the 
  right 
  side 
  and 
  the 
  mouth 
  of 
  the 
  

   resonator 
  gradually 
  and 
  slowly 
  closed 
  hy 
  the 
  palm 
  of 
  the 
  

   hand, 
  she 
  stated 
  that 
  the 
  fork 
  had 
  been 
  moved 
  to 
  her 
  left 
  

   side. 
  

  

  The 
  use 
  of 
  two 
  ears 
  for 
  comparison 
  is 
  probably 
  necessary 
  

   for 
  any 
  but 
  a 
  most 
  rudimentary 
  determination 
  of 
  directions 
  

   of 
  sounds. 
  What 
  power 
  there 
  is, 
  seems 
  to 
  be 
  due 
  to 
  the 
  

   increase 
  or 
  decrease 
  in 
  the 
  intensity 
  of 
  the 
  sound 
  produced 
  

   by 
  a 
  decided 
  lateral 
  position 
  of 
  the 
  sounding 
  body. 
  There 
  

   is 
  no 
  faculty 
  of 
  locating 
  by 
  phase 
  relation 
  in 
  such 
  a 
  case. 
  

  

  Combination 
  of 
  Two 
  Tones. 
  

  

  The 
  tone 
  given 
  by 
  a 
  musical 
  instrument 
  usually 
  consists 
  

   of 
  a 
  fundamental 
  combined 
  with 
  several 
  overtones 
  of 
  rela- 
  

   tively 
  feeble 
  intensity, 
  and 
  we 
  undoubtedly 
  locate 
  their 
  

   position 
  by 
  the 
  fundamental 
  wave, 
  ignoring 
  the 
  higher 
  tones. 
  

   This, 
  for 
  example, 
  was 
  found 
  to 
  be 
  the 
  case 
  when 
  an 
  organ- 
  

   pipe 
  was 
  used, 
  as 
  no 
  confusion 
  occurred 
  from 
  the 
  presence 
  

   of 
  its 
  harmonics. 
  But 
  the 
  conditions 
  are 
  altered 
  when 
  two 
  

   forks 
  of 
  different 
  pitch 
  are 
  struck 
  with 
  equal 
  force, 
  or 
  still 
  

   better 
  the 
  shriller 
  one 
  a 
  little 
  harder, 
  and 
  held 
  to 
  the 
  T-piece 
  

   simultaneously. 
  

  

  1. 
  Forks 
  c^ 
  (w 
  = 
  256) 
  and 
  c'^ 
  (n 
  = 
  512) 
  were 
  tried 
  in 
  this 
  

   manner. 
  The 
  two 
  tones 
  combined 
  so 
  that 
  the 
  separate 
  notes 
  

   were 
  heard 
  with 
  great 
  dijBficulty. 
  At 
  100 
  the 
  direction 
  was 
  

   middle, 
  at 
  40, 
  1/2 
  left, 
  and 
  at 
  160, 
  1/2 
  right. 
  Comparison 
  

   with 
  figs. 
  5 
  and 
  8 
  shows 
  that 
  the 
  lower 
  tone 
  exerted 
  the 
  

   greater 
  influence. 
  

  

  The 
  results 
  obtained 
  with 
  chords 
  of 
  less 
  perfect 
  harmony 
  

   were 
  not 
  so 
  simple. 
  

  

  2. 
  Forks 
  c' 
  (71 
  = 
  256) 
  and 
  e' 
  (n=320).— 
  At 
  100, 
  the 
  tones 
  

   combined 
  in 
  a 
  chord, 
  whose 
  direction 
  was 
  middle, 
  and 
  the 
  

   component 
  tones 
  were 
  not 
  heard. 
  

  

  At 
  40, 
  e^ 
  was 
  heard 
  distinctly 
  and 
  by 
  the 
  right 
  ear 
  only 
  

   with 
  a 
  location 
  of 
  full 
  right 
  ; 
  c' 
  w^as 
  heard 
  by 
  the 
  left 
  ear 
  

   only 
  with 
  a 
  direction 
  of 
  half 
  left. 
  Besides 
  these, 
  the 
  combi- 
  

   nation 
  chord 
  w^as 
  noted 
  as 
  being 
  rather 
  indistinct 
  and 
  near 
  

   the 
  middle. 
  

  

  At 
  160, 
  e^ 
  full 
  left, 
  and 
  c^ 
  one-half 
  right. 
  The 
  chord, 
  

   indistinct 
  and 
  one-fourth 
  right. 
  

  

  