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Klarinet Archive - Posting 000686.txt from 2001/04

From: jim & joyce <lande@-----.com>
Subj: [kl] Re: klarinet Digest 28 Apr 2001 20:15:01 -0000 Issue 3048
Date: Sat, 28 Apr 2001 21:46:03 -0400

Dee writes:
>Now humidity is another story entirely. Water cause
extreme swelling of the
>wood. Dryness can cause extreme shrinkage of the wood.
Water has an
>extreme expansion and contraction rate with temperature and
has been known
>to crack rocks.

I have been rereading Bruce Hoadleys book on wood. Wood
changes dimension with change in moisture content, which in
terms is based on relative humidity, which usually is much
higher inside a clarinet than outside. Of particular
interest, wood tends to expand twice as much in the
direction of the growth rings than it does perpendicular to
the growth rings (and very very little in the third
dimension.) The total amount of expansion between the
driest and wettest conditions varies by species. Grenadilla
was not on the list. The lowest shown was teak, with 4% in
one direction and 2% in the other.

jim lande

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