---------------------- multipart/alternative attachment Ric My guess is Mr Bluethner didn't pay that much precise attention to the amount of crown especially if he was compression crowning ,which he was. Judging by the one & only one I've rebellied he didn't get much crown for long as his ribs were to flat & not tall. Panel was falling apart. If he had a 60 ft radious thru out I'd be surprised. And historically ribs that short meaning not tall ,as we've discussed much, won't hold a compression crown many years. I think they just knew compression was apart of the accepted recipe of the day & this is how it was done. He did have a beautiful sweeping cutoff bar though and his ribs did some fanning as I recall. Crown the ribs to something tolerable & the piano will be fine. His scales were also horrible & whacky & all over the map. a new bridge is what the one I did needed. Didint' get it though Hey it is what it is as my wife says. Rumor has it that his glue maker was the worst and so getting a Bluethner apart is a cake walk. That's why he used all those screws in the face of the board. It'll be interesting to hear the progress on yours. If you need advice........ Dale I'm about to get started on an old first year production Julius Bluthner Patent Grand and will be using this basic approach to repairing the soundboard. I have to try and find out what degrees of crown old Julius used way back when, and how achieved it first. That kind of info seems difficult to be sure of. Cheers RicB ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/bf/fc/13/db/attachment.htm ---------------------- multipart/alternative attachment--
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