I suspect "rib crowned" soundboards have been around a lot longer than we would like to think. I rebuilt a McCammon, 54" Upright, 1879. A rather strangely built piano, in many ways. It definately had a Rib Crowned Sound Board! Albeit the grain of the soundboard was almost at right angle to the long bridge! Best Regards, Joe Garrett, RPT, (Oregon) Been There, Didn't Like It, So I'm Here To Stay! [G}
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