Interesting Old Soundboard

[Erwinspiano@AOL.COM]

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In a message dated 3/22/2002 6:20:55 PM Pacific Standard Time, 
mfarrel2@tampabay.rr.com writes:


> Subj:Interesting Old Soundboard 
> Date:3/22/2002 6:20:55 PM Pacific Standard Time
> From:<A HREF="mailto:mfarrel2@tampabay.rr.com">mfarrel2@tampabay.rr.com</A>
> Reply-to:<A HREF="mailto:pianotech@ptg.org">pianotech@ptg.org</A>
> To:<A HREF="mailto:pianotech@ptg.org">pianotech@ptg.org</A>
> Sent from the Internet 
>   Terry

   >>>..  I've checked out a bunch too. The knabe as far as my observations 
go is the only upright I've seen with crowned ribs. This is dangerously thin 
but they obviously had a concept they were working.>>>>>..
             
> I yanked the soundboard out of an old (qbout 1890) Knabe upright the other 
> day. I've been looking at it since then and have started to wonder about 
> it. Why did they make it the way they did? It is thin. Six millimeters 
> thick along the long bridge, and thinned to 4.5 mm in the area of the bass 
> bridge. Is this unusually thin? It had kinda hefty ribs, and quite some arc 
> to them. After taking the ribs off the board, I see that most of them have 
> about a 35 to 40-foot radius curve to them.
>>>>>>>>>>Thats really tight,how did you determine the radius>>>>>>>>>>>
 Amazingly tight. And they must have been subject to a fair amount of 
> compression crowning also because the back side of the ribs is curved quite 
> a bit also, unless of course they cut/plane them that way. I thought all 
> the old timers used 60-foot arcs?

>>>>>>>.I'm not sure they gave it much thought>..----Dale

> 
> Boy, I can see that one could spend a lot of time on the back of 
> soundboards getting to know them.
> 
> Terry Farrell
>   


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