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From: T...@stsm.demon.co.uk (Tony Pay)
Newsgroups: alt.music.clarinet
Subject: Re: Vito Reso-tone  U.S.A 3 Clarinet'
Date: Sat, 15 Sep 2001 11:09:46 +0100
Message-ID: <20010915.110946.74@stsm.demon.co.uk>
References: <W6DFlIAzUmo7Ew1O@yarlside.demon.co.uk>
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In article <W6DFlIAzUmo7E...@yarlside.demon.co.uk>,
          d...@yarlside.demon.co.uk (Doug) wrote:

> Speaking of low pitch before warm-up ,  -  does anyone have any 
> technical knowledge about the reason why it takes so long to come up
> to  pitch , - and what are the main parameters  to consider. My
> present thoughts are that your embouchure is not properly tempered 
> until your lip muscles are used for a short while. Also the instrument
> is cold and this affects the width (or length) of  the bore,   - and
> hence the pitch change to a higher pitch when it gets  warm.

I don't think embouchure is very significant.

The bore of a clarinet changes very little with temperature.  What
affects the pitch is the temperature of the air inside, and this is
significantly lowered by the cold walls to begin with.  Obviously the
thermal conductivity of the walls is involved too, and I imagine that
plastic conducts away heat faster than wood, so it comes up to
pitch only gradually on continuous playing, and not completely until the
instrument is warmed throughout.

Wood, I suppose, on this picture, comes up to pitch quicker on
continuous playing.  Does that fit?

Probably someone knows some numbers.

Another playing consideration is that turbulence sets in more readily
when the ambient temperature is low.  Thus the instrument 'rings' less
well when it's cold.  (See Benade, as usual.)

Tony
-- 
_________       Tony Pay               
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... Mr. Worf, set phasors on spin dry.