<HTML><BODY BGCOLOR="#ffffff">In a message dated 11/23/02 2:15:20 PM Central Standard Time, Richard.Brekne@grieg.uib.no writes: <BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">Natural crown is an older English (British) term which seems to rougly equate your term Compresson Crowning. Junghanns text discerns between straight ribs on a flat panel, vs a panel pressed into a dished caul. In both cases we are talking about a thoroughly dried board, ribs across the grain. And in both cases crown is achieved by allowing the finished glued assembly to take on moisture. Where he notes differences are </BLOCKQUOTE> Hmmm, seems to me the term "natural crown" would fit straight ribs on a flat panel with moisture being the catalist to crown much better than mechanically forcing crown with a curved caul.  I would be interested in how they came up with it. David Koelzer Vintage Pianos DFW</HTML>