<HTML>In a message dated 12/18/2002 6:11:40 PM Pacific Standard Time, davidlovepianos@earthlink.net writes: <BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">Subj: Re: Bridgetop Extravaganza Revisited Date: 12/18/2002 6:11:40 PM Pacific Standard Time From: <A HREF="mailto:davidlovepianos@earthlink.net">davidlovepianos@earthlink.net</A> Reply-to: <A HREF="mailto:pianotech@ptg.org">pianotech@ptg.org</A> To: <A HREF="mailto:pianotech@ptg.org">pianotech@ptg.org</A> Sent from the Internet Get two blocks of wood measuring exactly 7" high.  Place them on the soundboard at opposite edges of whatever part of the piano you want to measure.  Put a straight edge across the top of the two blocks and at a point midway between the blocks, measure the distance from the bottom of the straightedge to the soundboard.  Subtract that number from 7" and the amount left over is the amount of crown.   David Love               Hi Dave </BLOCKQUOTE>           Not so.  In Steinway and other pianos the net result of the diaphramizing (panel thinning) can leave the board thickness at the edges where the blocks are placed at .250 thick and the middle of the board can be as much or more than 100. thicker. Even with a flat board this method of measuring crown would give a false reading as the middle of the board will always be thicker (higher) than the edges. If you use this method you've got to factor this in.        Dale Erwin </HTML>