Hello, David and welcome to the list. This piano sounds interesting. I would like very much to know how string motion is contained to the vertical only. Normal precession of matter in motion gradually becomes chaotic, or in the case of piano strings become circular. When you get the information back perhaps you could find someone with a scanner to scan it for you so you could share it with us. I look forward to your further posts. Happy holidays. Newton J. Hunt nhunt@jagat.com New Brunswick, New Jersey
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