DC

[Ruth Phillips]

To Chris Purdy and the list,
Our experiments show that you must bring the highs
of humidity down to where you can bring the low up
to, for cross-season stability.  In other words,  if the
maximum you can achieve in the dry season is about
35%, you need to get close to that in the wet season.
Usually, adding one or more extra dehumidifiers,
placed in a way that distributes the heat evenly,
will take care of that nicely.  They must also be installed
in a way that provides even feedback to the control,
and doesn't fight with the humidifier.
Sorry I'm about two weeks behind your discussion.
Ruth Phillips
-----------------------
|
| Date: Tue, 1 Aug 2000 18:16:16 -0400
| From: "Christopher D. Purdy" <purdy@oak.cats.ohiou.edu>
| Subject: Re: Dampp-Chaser systems in university pianos
|
| Our biggest problem here is extreme dryness in the winter, down to
7-10%
| sometimes.  (my little hygrometers are not very high tech so not
accurate
| under 28% or so but that is a good average).  What I have been finding
is
| that the pianos do not drop in pitch as much in the winter now but as
I am
| doing my summer tuning right now, they are still averaging about 16-20
| cents sharp.