Compression rigs (ridges)

[David Love]

Those aren't what compression "ridges" look like nor does a compression
ridge mean the soundboard is out necessarily.  A compression ridge is
usually a single and slightly raised line along the grain, though there may
be several compression ridges in a single panel.  They usually run the
length of the panel or a good portion of it.  This looks more like a
mottling of the finish.  It's hard to imagine an 1898 soundboard has much
left in it no matter what the circumstances, though.  

David Love
davidlovepianos at comcast.net 
www.davidlovepianos.com

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Stéphane Collin
Sent: Tuesday, June 20, 2006 11:03 AM
To: Pianotech List
Subject: Compression rigs

Hi all.

I join a picture of a 1898 Pleyel concert grand soundboard (close-up).
Is this what you call compression rigs ?
Does this mean that the board is out ?

Thanks in advance for expertize.

Stéphane Collin.