---------------------- multipart/mixed attachment --=====================_41513623==.REL >Regarding the hysteresis loss of bridge coatings (or indeed of the bridge= =20 >cap itself), I am not much of a fan of the string being in contact with=20 >the bridge cap at all. Therefore, the idea of a bridge agraffe would seem= =20 >to have (in principle) considerable merit. The image below is a grey-scale= =20 >jpeg of the latest Stuart piano agraffe. > > >2795f9e.jpg > > >The use of a high hysteresis material (such as silicon rubber) on the body= =20 >of the agraffe would seem to negate a major benefit of using the device.=20 >Of course, if there is such a small clearance between the agraffe body and= =20 >the strings that it causes string noise, one would have little choice but= =20 >to use a lossy material as a 'cure' (apart from redesigning the agraffe=20 >which would be a better solution). Silicon on noisy agraffes 'kills' the=20 >tone nearly as effectively as damping out the front duplex to 'cure'=20 >string noise. They're getting taller, though I can't imagine why they would need to.=20 Except for being roughly twice as tall as it should realistically need to=20 be (and robbing the difference from bridge height and stiffness), it's a=20 nice looking bridge termination. Like you, I wonder why the silicone rubber= =20 is there. As short as that segment is, even at that low deflection angle,=20 why would it need to be damped? Is it even possible for a segment that=20 short to make noise? What is that, 10 millimeters maximum at nearly a 10=B0= =20 angle on the speaking side? How much noise would that make? There doesn't=20 seem to have been any attempt made to straighten the strings beyond the=20 bends here either. Is there a (long overdue) technical nomenclature term=20 for that, and is that normal for these pianos? --=====================_41513623==.REL A non-text attachment was scrubbed... Name: 2795f9e.jpg Type: image/jpeg Size: 90921 bytes Desc: not available Url : https://www.moypiano.com/ptg/pianotech.php/attachments/f7/9c/83/38/2795f9e.jpg --=====================_41513623==.REL-- ---------------------- multipart/mixed attachment Ron N ---------------------- multipart/mixed attachment --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.530 / Virus Database: 325 - Release Date: 10/22/2003 ---------------------- multipart/mixed attachment--
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