﻿388 
  

  

  Dr. 
  Barton 
  and 
  Mr. 
  Laws 
  on 
  Air-Pressur 
  

  

  In 
  valve 
  instruments 
  the 
  same 
  results 
  are 
  usually 
  approxi- 
  

   mately 
  obtained 
  by 
  the 
  use 
  of 
  three 
  valves. 
  The 
  first 
  valve, 
  

   when 
  dejDressed, 
  adds 
  sufficient 
  tubing 
  to 
  lower 
  the 
  notes 
  by 
  

   a 
  whole 
  tone, 
  the 
  second 
  valve 
  a 
  semitone 
  only, 
  and 
  the 
  third 
  

   about 
  a 
  tone 
  and 
  a 
  half. 
  

  

  These 
  facts 
  are 
  exhibited 
  collectively 
  in 
  Table 
  I. 
  for 
  an 
  

   instrument 
  tuned 
  to 
  Bb 
  like 
  the 
  Cornet 
  and 
  Tenor 
  Trombone. 
  

   The 
  lower 
  notes 
  are 
  at 
  the 
  bottom 
  o£ 
  the 
  table. 
  Those 
  in 
  

   round 
  brackets 
  indicate 
  alternative 
  fingerings. 
  The 
  numerals 
  

   under 
  some 
  of 
  the 
  notes 
  give 
  approximate 
  frequencies 
  for 
  the 
  

   trombone 
  in 
  complete 
  vibrations 
  per 
  second. 
  For 
  the 
  cornet, 
  

   all 
  these 
  require 
  doubling. 
  

  

  Table 
  I.— 
  

  

  The 
  Scale 
  on 
  Slide 
  and 
  Valve 
  Instruments. 
  

  

  Positions 
  of 
  Slide 
  

   on 
  Trombone. 
  

  

  1st. 
  

  

  2nd. 
  

  

  3rd. 
  

  

  4th. 
  

  

  5 
  th. 
  

  

  6th. 
  

  

  7th. 
  

  

  Valves 
  depressed 
  

   on 
  Cornet. 
  

  

  None. 
  

  

  2nd. 
  

  

  1st. 
  

  

  : 
  

  

  1st 
  & 
  

   2nd. 
  

  

  1st 
  & 
  

   3rd. 
  

  

  2nd& 
  

   3rd. 
  

  

  1st, 
  2nd, 
  

   &3rd. 
  

  

  Number 
  of 
  partial 
  

  

  tone 
  or 
  

  

  "Harmonic" 
  

  

  elicited 
  by 
  suitable 
  

  

  " 
  embouchure 
  " 
  

  

  and 
  air-pressure. 
  

  

  

  

  Sames 
  of 
  

  

  Notes. 
  

  

  

  

  r 
  ~ 
  

  

  

  

  > 
  

  

  8 
  

  

  Bfer 
  A 
  

  

  480 
  ! 
  1 
  

  

  G 
  

  

  not 
  

  

  

  

  — 
  

  

  

  

  7 
  

  

  This 
  harmo 
  

   general 
  ly 
  used 
  

  

  nic 
  is 
  

  

  6 
  

  

  F 
  E 
  

   360 
  

  

  

  (D) 
  

  

  300 
  

  

  

  5 
  

  

  D 
  

   300 
  

  

  

  C 
  

  

  

  (Bb) 
  

   240 
  

  

  (F) 
  

   180 
  

  

  

  

  4 
  

  

  Bb 
  

   240 
  

  

  A 
  

  

  

  G 
  

  

  3 
  

  

  F 
  

  

  180 
  

  

  E 
  

  

  

  D 
  

  

  

  C 
  

  

  B 
  

  

  ') 
  

  

  Bb 
  A 
  

   120 
  

  

  

  Gr 
  

  

  

  F 
  

  

  E 
  

  

  1 
  

  

  Bfer 
  

   60 
  

  

  This 
  prime 
  

   is 
  not 
  genera 
  

  

  note, 
  cal 
  

   lly 
  used. 
  

  

  led 
  the 
  

  

  "pedal,"' 
  

  

  i 
  

  

  