Klarinet Archive - Posting 000808.txt from 1998/09

From: "Edwin V. Lacy" <el2@-----.edu>
Subj: RE: [kl] Pitch standard confusion
Date: Tue, 22 Sep 1998 18:18:15 -0400

On Mon, 21 Sep 1998, Michael Cogswell wrote:

> Actually, when a cylinder expands the bore gets bigger not smaller. The
> expansion causes an increase in the circumference, hence the inside
> diameter increases. However, it is relatively moot. I'm in agreement
> with the argument that the change in air density is much more
> significant.

I've never measured it myself, but I have it on what I consider to be good
authority, namely a prominent instrument manufacturer, that the above
assertion is incorrect. AS I understand it, the integrity of the external
circumference prevents the material from expanding in that direction.
Thus, the only way for the material to move is inward, thus causing the
bore to become smaller.

Ed Lacy
el2@-----.edu

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