[CAUT] temperature and pitch

[Cramer, Mark]

We're (Brandon University) heading towards full-length covers as a means of slowing the exchange of air between soundboard and room.

The situation then becomes semi-exposure (cover folded 1/2-way back in rehearsal mode) during the day, and fully-covered overnight... and that's presuming alot on the last student out the door.

Nonetheless, we're trying to combat the net losses through the dry-heating season with "over-night recovery," rather than the micro-change between cover on/cover off during a tuning.

Will let you know how it works after a year or two.

best regards,
Mark Cramer,RPT
Brandon University/The Banff Centre for the Arts





-----Original Message-----
From: Ron Nossaman <rnossaman at cox.net>
To: caut at ptg.org
Date: Wed, 16 Dec 2009 23:29:46 -0600
Subject: Re: [CAUT] temperature and pitch

Fred Sturm wrote:
> No, I'm not making a case for anything, just trying to be sure I 
> understand the circumstance. I think that the confined system you 
> describe would obviously lead to a build up of moisture and heat, as you 
> describe, with the cycling of adding humidity and then heating to try to 
> reduce it. Seems a little counter to the design of the D/C system. I 
> remember reading about the 9 part system for the back side of uprights, 
> and how they would include a back cover, but it needed to be open by 
> some amount to allow for exchange of air. IOW, air exchange is part of 
> the way the system is supposed to operate.

As I said, I was concerned when I opened one up and felt the 
warm moist air pour out.


>     I don't have any systems in pianos with floor length covers, so it 
> is an unfamiliar animal to me. I don't think I would be inclined to 
> recommend it.

Actually, someone else recommended the full length covers, 
more to protect the case finish than anything else I suspect, 
but I've seen no reason not to after the fact. Time will tell, 
perhaps.
Ron N