Whole room humidity control better than Dampp Chaser. ( Right?)

[Andrew and Rebeca Anderson]

Terry,
Wool does absorb and release.  I'm thinking of extremes.  Common 
example: air-conditioned house, door opened for guest, warm wet air 
blows over cold dry plate and strings and you quickly have visible 
condensation.  Not with a cover.  The humidity doesn't hit all at once.

Barrier or buffer, it still works well.

Andrew


At 09:19 AM 2/18/2008, you wrote:
>Andrew - I've heard this before. I'm not going to argue against it, 
>but I have to admit it makes no sense to me. Perhaps I just don't 
>understand. Logic tells me that if the wool cover "buffers" 
>humidity, that means it absorbs humidity. Humidity is water vapor, 
>i.e. water molecules. So where does the water go then? At some 
>point, the blanket is going to start dripping when it reaches saturation.
>
>If one were to ring the wool cover out now and then and discharge 
>the water that way, I could understand, but otherwise it seems 
>impossible to me. What is the physical/chemical mechanism at work here?
>
>Are you aware of any authoritative source of information regarding this?
>
>Thanks.
>
>Terry Farrell
>----- Original Message -----
>A wool-felt string-cover alone will protect the strings against 
>rust.  That has been well established by grand pianos in (ocean 
>front) beach-houses with string-covers that have brand-new looking 
>interiors after decades as compared to their unprotected 
>neighbors.  Wool has the natural capacity to buffer humidity and any 
>sort of cover probably prevents condensation.  This is the first 
>accessory I recommend.
>
>Add a DC system and undercover and you will then reduce the 
>sound-board oscillation to negligible resulting in tunings that last 
>until your next service.  You get to do a concert level tuning each 
>time you return to the instrument.
>
>I have two Sauters on the floor here.  They are fine pianos which 
>are much more stabile than average.  One has a DC with undercover 
>and the other has DC with undercover and string-cover.  The one 
>without the string-cover is noticeably (to me) affected by the 
>weather.  The other one hasn't been tuned in a coon's age and still 
>has a solid tuning on it.
>
>YMMV
>Andrew Anderson

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