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Klarinet Archive - Posting 000242.txt from 2004/12

From: "Dee Flint" <deeflint01@-----.net>
Subj: Re: [kl] Buffet Greenline and temperature
Date: Tue, 14 Dec 2004 23:42:15 -0500


----- Original Message -----
From: "Bill Hausmann" <bhausmann1@-----.net>
To: <klarinet@-----.org>
Sent: Tuesday, December 14, 2004 10:07 PM
Subject: Re: [kl] Buffet Greenline and temperature

> At 10:39 AM 12/14/2004 -0500, Vann Joe Turner wrote:
>>Hi All,
>>
>>I'm looking to get a new R13, and have a question on the Greenline series.
>>On Woodwind and Brasswind one of the user "reviews" seems to indicate that
>>the Greenline is not susceptible to change in pitch as the horn warms up.
>>
>>Is this true? If so, it'll appear to be an added advantage.
>
> Can't say for certain, but there are good reasons to suspect that it would
> be true. That material should at least be somewhat more dimensionally
> stable than wood.
>
>
> Bill Hausmann
>

The dimensional change of a clarinet due to temperature changes (whether the
material is wood, plastic or metal) is too small to be measured except with
extremely precise, accurate, and expensive equipment. It would have an
unnoticeable effect on pitch. The change due to temperature is on the
approximate order of 0.000001 inch per inch of length per degree Fahrenheit
(this is actually for metal, wood or plastic is normally even less). Thus a
20° F temperature change (say room temperature to breath temperature) would
result in a change of length on the approximate order of 0.00024 inches (or
even less) for a clarinet.

As another poster has already discussed, the change in pitch is due to
stabilizing the temperature in the air column inside the horn. When the
inside of the wall of the instrument is still cold, it will cool the air
that you are blowing into it. As you blow, the wall warms up and has less
and less of a cooling effect on the air column. As you warm up, you
eventually reach a state of equilibrium between the effect of the air
temperature on the wall and the wall temperature on the air.

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