----- Original Message ----- From: "Farrell" <mfarrel2@tampabay.rr.com> To: "Pianotech" <pianotech@ptg.org> Sent: July 28, 2003 4:19 AM Subject: Re: Rib overkill > I've disembowlled several old (pre-American/Aeolian) Knabes and am sure they machined quite a bit of crown into their ribs. I've got a strung 1902 6' 4" Knabe in my shop now waiting for a new board that has pretty good downbearing and a good 3/16" of crown along the longer ribs and 1/16" to 1/8" in the high treble and treble areas. I just measured a 44-inch-long rib off an old Knabe upright - it has a full 5/8" of crown to it (this would work out to something like about a 25-foot radius crown). Was anyone a hundred years ago using crown radii tighter than 25 feet? > > Terry Farrell I've not found any written evidence of this, but there are a few examples that indicate at least some were thinking along these lines. Whether this was by design or by a mistake of manufacturing tolerance, who knows. Del
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