> Are you saying that the rise and fall of RH and it's > affect on a strung up piano will *not* cause the middle of it's > soundboard to rise and fall? > Fenton Murray, RPT Nope, not at all. That has nothing at all to do with an arch, and will happen whether a soundboard is glued to a rim or not. Try it. Dry down a piece of spruce that's representative of a panel (as in the article), glue it to a straight rib, and stand back and watch crown form as the panel absorbs humidity and expands. Then ask yourself, how can it be an arch with no end buttress? Ron N
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