Temperature Change affecting pitch

[John Ross]

Hi,
Perhaps, I should rephrase. On recirc, it definately removes moisture,
in this climate anyway. Proven by the humidity guage, that Dampp-Chaser
sells.
If the humidity of the outside air is in the 80's, it is less, after it
gets cooled, and put into the house. That is the way it works, around here.
So I guess we will have to agree to disagree.
Regards,
John M. Ross
-----Original Message-----
From: owner-pianotech@ptg.org [mailto:owner-pianotech@ptg.org]On Behalf
Of Larry J. Messerly
Sent: March 29, 2000 9:55 PM
To: pianotech@ptg.org
Subject: Re: Temperature Change affecting pitch


Cool air flowing across the strings shortens them raising the pitch. By
the way, AIR CONDITIONING DOES NOT, REPEAT NOT, REMOVE WATER FROM THE
AIR.
BTW air conditioning does not remove water from the air.  Any water you
see dripping from the condenser coils comes from outside the structure.
Larry

On Wed, 29 Mar 2000 16:43:00 -0500 "Farrell" <mfarrel2@tampabay.rr.com>
writes:
> Now why would turning on the AC make a piano go sharp? The cooler
> temp.
> would make the plate and case contract (albeit very slightly), thus
> lowering
> pitch, and the lower humidity (because any properly operating AC
> unit will
> remove water from the air, thus lowering relative humidity) would
> tend to
> make the soundboard contract, again lowering the pitch. Why in the
> world
> would it go sharp?
>
> Terry Farrell
> Piano Tuning & Service
> Tampa, Florida
> mfarrel2@tampabay.rr.com
>