My house has a few half round corner shelves, in pine. The shelves
appear to be from two to three edge joined boards and are quarter sawn.
On the underneath is a shallow groove running from 1/2 way down one
straight edge across to the same place on the other straight edge. Now
it occurs to me that this might be to prevent cupping, except that
grooves to prevent cupping usually run with the grain. Is my surmise
correct, and if so why across the grain, and why in quarter sawn? Just
Plate grooves. So you can stand display dishes on edge without special holders.
Check the insides of most fancy corner cabinets, similar straight cabinets.
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