This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Time for the digital camera... David Ilvedson, RPT Pacifica, California Original message From: "Aaron Bousel" To: "College and University Technicians" Received: 2/21/2006 10:11:19 AM Subject: Re: [CAUT] Another first I thought I'd seen every possible configuration of a vertical piano ove= r the past three decades, but I saw one recently that was new to me. Th= is is an Estey made in 1891. I'm attaching a sketch I made but here's h= ow this is supposed to work. The backcheck is in two parts, and pivots = by a center pin towards the top. There is a coil spring towards the bot= tom. The idea is that upon release of the hammer from check the backche= ck will give a little push on the catcher, just enough to help the jack= get back against the butt felt. There's a set screw at the very top of= the backcheck which limits the travel of the piece that pushes the cat= cher. The piano was in such poor condition that there was no way I coul= d see if this theory actually worked in practice, though I don't see wh= y it wouldn't. Aaron ------------------------------------------ Aaron Bousel Registered Piano Technician, Piano Technicians Guild abousel@comcast.net (413) 253-3846 (voice & fax) ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/caut.php/attachments/ff/e1/3c/ff/attachment.htm ---------------------- multipart/alternative attachment--
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