This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Why does the high treble scale not have slightly thinner, somewhat = longer strings? It seems to me that the short speaking lengths would = contribute to lack of sustain, excess hammer sound vs. musical tone, = difficulty in tuning etc. If breakability is a principal reason, could not the action be modified = at that end with more let-off or such. I am fully aware that this question probably is naive, based on my = limited experience, so I brace myself for incoming ... Alan Barnard ----- Original Message -----=20 From: jolly roger=20 To: Pianotech=20 Sent: Sunday, September 15, 2002 2:00 PM Subject: Re: Upright and Grand rims, was: Impressive Steinway Upright Hi Del, Nice drawing, kind of in line with some of my ideas of = theoretical centreing of bridges for grands. What we tend to forget is that, the vibrations spread out from the = bridge like a pebble thrown into a Mill pond. In a grand, because of the = strike line and the position of the belly rail, the bridge is far from = centred. Some of this problem may be alleviated by varying the rib = height. Thinner to the short side, taller to the long side. The design of the case and action position of vertical pianos will = always give more flexibility than in a grand. The thickness of the belly rail joint ( reflector ) to the board in = the top treble is going to be a problem, along with where the bridge is = fixed, vs the hammer line. Lots of tap dancing is done in the extreme treble to get better = sustain, duplexing, undercutting the bridge,etc. Ever tried putting an = apron up there? I know off the wall.mmmmmmmmm Shoot me I am being = revolutionary. With accujust hitch pins to reduce board loading in a controlled = manner, along with an apron, and finally a variable height rib, we could = theoretically centre that bridge. Sunday musings.=20 Roger =20 Good (no, excellent) explanation so far. But it's not any super-secret shape--though it is patented--and it = has been pretty well developed. A jpg drawing of the soundboard assembly as = used in our upright is attached. Del _______________________________________________ pianotech list info: https://www.moypiano.com/resources/#archives ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/5d/d4/81/51/attachment.htm ---------------------- multipart/alternative attachment--
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