John D, Del, Ron N., Stephen and all, > Have you, Del, or you Ron O, ever allowed longitudinal wave >considerations to affect your scale calculations? I think we should >be told. Sorry folks, I haven't been paying attention over the past couple of days - got distracted with earning a living. Just had a quick catch up. To answer your question JD, no I haven't taken longitudinal waves into consideration when designing scales. Reading Del's comments on his scaling approach, I design scales in a similar fashion where I consider percentage of breaking strain deviation, inharmonicity and string impedance (the compounding effect of the sound board on impedance is another matter). Regarding these three parameters, all cannot be satisfied simultaneously at the transition from the last plain wire to the first covered. I sacrifice percentage of breaking strain to achieve uniformity of the other two factors. Carefully done, it is possible to limit the % deviation increase, when going from trichord plains to bichord covers, to less than 15 % for modifying production scales, and around 11% for my own instrument. Ron N I think works along similar lines? Stephen's post on longitudinal modes was most interesting. No opinions from me on this one. I'm in the stalls. While I've done no serious investigation into longitudinal harmonics, I've been aware of them, occasionally exciting the bass strings longitudinally to have a listen and ponder. But to date, dealing with them has been restricted to the voicing needles. Thanks Ron N for those pat. no.s also. Ron O. -- ______________________________ Website: http://www.overspianos.com.au Email: mailto:ron@overspianos.com.au ______________________________
This PTG archive page provided courtesy of Moy Piano Service, LLC