>It strikes me that the main thing about the Wapin arrangement is the >near perpendicular disposition of the front pin. Without reading >right through the patent I can't be sure if he says anything about >the way the "bearing point edge" is cut and whether a small vertical >drop is desirable (a feature Wolfenden admires in the practice of one >maker, probably Ibach) or whether this angle should be at least >steep, as it certainly is not on the Steinway. Yes, the vertical pin is the pertinent point. Tim Coates straightened me out on this a while back. The purpose of the vertical pin is to steer the string oscillations to horizontal, or parallel to the soundboard. This slows energy transfer to the bridge/soundboard and extends sustain as a result. Ron N
This PTG archive page provided courtesy of Moy Piano Service, LLC