[CAUT] temperature and pitch

[Fred Sturm]

On Dec 12, 2009, at 12:52 PM, Jeff Tanner wrote:

> Yes, your D/C system was operating all along, which is why wonder if  
> the inside of the piano was affected as much by a 10 degree change  
> outside.


	Today I tuned a Steinway B with a double tank D/C system installed.  
It has an undercover, and the lid was closed (covered with Christmas  
decorations) and stayed that way while I tuned it. I placed my Mannix  
CMM880 thermo-hygrometer on the plate as far as I could reach. It  
measured 70.3F. I placed it on a table next to the piano. It measured  
71.0F. I repeated a couple times while tuning to be sure, leaving it  
in each location for several minutes. No mistake.
	I'm guessing the D/C rods did not add significantly to the  
temperature of the plate. I don't think there is any real significance  
to the piano being cooler - probably something to do with heating  
system cycling, and the air inside the piano being static. But I think  
my earlier assessment was correct: the D/C produced heat was not a  
significant factor.
Regards,
Fred Sturm
University of New Mexico
fssturm at unm.edu