Soundboard EMC

[Farrell]

I have experienced pitch changes of several cents when an AC unit kicked on. My assumption is temperature affecting metal parts of piano. Just my guess.

Terry Farrell
  
----- Original Message ----- 
From: "Kevin E. Ramsey" <kevin.e.ramsey@cox.net>
To: "Pianotech" <pianotech@ptg.org>
Sent: Friday, November 22, 2002 10:51 PM
Subject: Re: Soundboard EMC


Terry, I don't doubt your findings, but how would you account for a piano going up in pitch 5 or 6 cents within minutes in an evironment of an evaporitive cooler going on, then.
    Could be due to the plate, strings cooling, but I'd like to know. 
  ----- Original Message ----- 
  From: Farrell 
  To: pianotech@ptg.org 
  Sent: Friday, November 22, 2002 8:43 PM
  Subject: Soundboard EMC


  FWIW:

  I had posted 16 days ago about how I dried a piece of Sitka Spruce down to zero moisture content (MC). I went on to say that I was surprised how long it took to regain moisture.

  Things haven't changed much.

  Well, here we are at 16 days in my shop of 70 -75 degrees F and 45% relative humidity, and the little piece of spruce is now up to 6.08% MC. It went from 5.91% to the present 6.08% in the past three days.

  My conclusion: spruce does not take up an appreciable amount of water in a short period of time.

  Ain't I smart?

  Terry Farrell
    
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