evaluating sdbd. crown & bridge downbearings in a new piano

[Ron Nossaman]

>
>  If a board is 'rib crowned' I would have no argument with saying the top 
>surface of the board is under tension and the bottom under compression but I 
>don't think the argument works with "compression boards"...does it? 

>Jim Bryant (FL)


* It doesn't work with rib crowned boards either, because the panel is under
compression with that system too, and does help support crown, just not as
much. The ribs do most of the work.

 Ron N