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Re: Instrument lengths/bore

To: brass-band@xxxxxxxxxxxxxx
Subject: Re: Instrument lengths/bore
From: John Gray <johnegry@xxxxxxxxx>
Date: Thu, 14 Dec 2006 11:42:27 -0800 (PST)
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Bflat cornet or trumpet, 4ft (1.2m) plus the valves.
Fundamental (natural) note Bflat 2nd line bass clef,
hard to sound on these

Bflat trombone, baritone etc 8ft (double = 1 octave)
Fundamental (pedal) open note Bflat two lines and
space below bass clef

BBflat bass 16ft.  Maybe "double" bass has fourth
valve?

"F" horn or trombone with "F" plug pulled or Euph w
4th valve down, 12 ft.

All approximate.  I am sure there must be a web site
somewhere with all these on accurately. Bore affects
tone/harmonics, not pitch, horns are conical start
narrow get wider all the way along: trumpets and Tb
cylindrical until near the bell. Older instruments
were usually narrow bore, bright sound, trombones got
bigger bore since about 1955 until everyone (well, a
lot) got fed up with the slushy fat tone and
compromised somewhere in between.  Holton offer a
trombone with different bores on the two halves of the
slide.

Pitch is also function of speed of sound which depends
on air density and temperature, colder = flatter.
Hence warm up your instrument with gentle breathing
esp. when just come in from the cold.

Rgds

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References:
- Instrument lengths
  - From: Rod Gibson

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