Re: [Harp-L] Re: Harp-L Digest, Vol 133, Issue 22

[Vern <jevern@xxxxxxx>]

If you cooled a brass reed by 20 degF, its pitch would INCREASE by about 1 centâ.imperceptible among the other variables affecting pitch.  (derived from the chart at http://www.engineeringtoolbox.com/young-modulus-d_773.html ) Note that E (modulus of elasticity) decreases with increasing temperature and that pitch is proportional to the square root of E.  

If the pitch is decreased by moisture on the reed, the effects would tend to cancel.

Vern

On Sep 22, 2014, at 5:36 PM, Larry Sandy <slyou65@xxxxxxxxx> wrote:

> Pat, that's interesting.  I have never heard that cold reeds are less flexible. That must translate into them playing a LITTLE FLAT until they warm up. I know cold reeds collect breath moisture quickly though, which would also lower the pitch. Interesting parallel.  I wonder if cold, moist reeds are double flat?  ð<br/><br/>Lockjaw Larry