﻿390 
  Dr. 
  Barton 
  and 
  Mr. 
  Laws 
  on 
  Air-Pressures 
  

  

  Table 
  III. 
  — 
  Pressures 
  for 
  given 
  Notes, 
  Loud 
  and 
  Soft. 
  

  

  Notes 
  

  

  F 
  

  

  Bt 
  

  

  F 
  

  

  Bb 
  

  

  D 
  

  

  1 
  

  

  Approximate 
  

   frequencies. 
  

  

  90 
  

  

  120 
  

  

  180 
  

  

  240 
  

  

  300 
  

  

  Positions 
  of 
  

   Slide. 
  

  

  6 
  

  

  1 
  

  

  1 
  

  

  1 
  

  

  1 
  

  

  pp. 
  

  

  p. 
  

   m. 
  

   f. 
  

  

  13 
  

  

  18 
  

  

  19-5 
  

  

  23 
  

  

  24* 
  

   34-5 
  

   36'5t 
  

  

  40 
  

  

  27 
  

  

  50 
  

  

  55-5 
  

  

  67-5 
  

  

  50 
  

  

  57 
  

   63 
  

  

  82 
  

  

  73-5 
  

   83 
  

  

  88-5 
  

   106 
  

  

  Single 
  | 
  

  

  crescendo 
  L 
  

  

  notes. 
  J 
  

  

  

  pp 
  20 
  | 
  

   to 
  to 
  I 
  

   / 
  38) 
  

  

  p 
  50] 
  

   to 
  to 
  I 
  

   ff 
  78 
  J 
  

  

  V 
  61] 
  

   to 
  to 
  \ 
  

   ff 
  101 
  J 
  

  

  

  * 
  This 
  pressure 
  was 
  obtained 
  with 
  a 
  small 
  aperture 
  between 
  the 
  lips. 
  With 
  

   a 
  larger 
  aperture, 
  the 
  note 
  still 
  beings?, 
  the 
  pressure 
  fell 
  to 
  15 
  ! 
  

  

  t 
  The 
  pedal 
  note 
  an 
  octave 
  lower 
  than 
  this 
  was 
  produced 
  m 
  with 
  a 
  pressure 
  

  

  of 
  7 
  cm. 
  

  

  Table 
  IV. 
  — 
  Pressures 
  for 
  same 
  Notes 
  in 
  Alternative 
  

   Positions. 
  

  

  Notes 
  

  

  F 
  Bb 
  

  

  D 
  

  

  Approximate 
  

   frequencies. 
  

  

  180 
  

  

  240 
  

  

  300 
  

  

  Positions 
  of 
  

   Slide. 
  

  

  1 
  

  

  6 
  

  

  1 
  

  

  5 
  

  

  1 
  

  

  4 
  

  

  No. 
  of 
  " 
  Har- 
  

   monic 
  " 
  used 
  

  

  3 
  

  

  4 
  

  

  4 
  

  

  5 
  

  

  5 
  

  

  | 
  

   6 
  

  

  o 
  

  

  w 
  m 
  f 
  

  

  w 
  

  

  "S 
  / 
  

   3 
  ff 
  

  

  50-5 
  

  

  50 
  

  

  73 
  

  

  80 
  

  

  48 
  

   50 
  

   68 
  

   83 
  

  

  72 
  

  

  75 
  

  

  94 
  

  

  113 
  

  

  70 
  

  

  75 
  

  

  92 
  

  

  110 
  

  

  72 
  

  

  98 
  

  

  119 
  

  

  67 
  

  

  92 
  ■ 
  1 
  

  

  117 
  J 
  

  

  | 
  

  

  i 
  

  

  2nd 
  Series 
  

   (1901) 
  m 
  

  

  55 
  

  

  50 
  

  

  67-5 
  

  

  68-5 
  

  

  72 
  

  

  72 
  

  

  