> From: "Don Mannino" <donmannino at ca.rr.com> > Date: March 12, 2011 12:50:57 PM EST > ... > Another important factor which is, if I recall correctly, mentioned in the > old patents is the benefit to the tone and longevity of the string from > changing the wire movement at the capo from a bending action to a pivoting > action. When the duplex length is short or the angle very steep, the wire > is effectively locked down against the capo. When the angle is lower and > the length is longer, the wire can rock or pivot slightly on the capo, > reducing stress on the wire. Thanks Don, for posting this; it opened my eyes some. I was of course aware of the energy transfer past the capo, but visualizing it as a pivoting action really makes it clearer how this happens, and why it would also affect string breakage. I would expect that the first and strongest wire displacement and pivot would be in the vertical direction immediately following hammer-string contact, while later and weaker displacements would migrate to the horizontal plane as the string oscillation changes. I will try to make careful note of any subtle hourglass shaping in the cuts in the bottom of the capo bar the next time I reshape one (as opposed to more of a funnel shape). In other words, the string cut might flare a little on both ends of the cut. Has anyone ever noticed such? Thanks, Joe DeFazio Pittsburgh -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://www.moypiano.com/ptg/pianotech.php/attachments/20110312/f558d532/attachment.htm>
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