Place a big plastic salad bowl upside-down on a flat table. Place a pencil under the bowl rim (between the rim and the table) at the 12:00 position and at the 6:00 position. Now the bowl will rock back and forth on the pencils. Push down on the center of the bowl. The bowl's rim will deflect into an ellipse. The axis defined by the pencils will expand outward, and the axis 90 degrees from that will contract inwards. It's possible that this is the geometry of certain sounding boards. M Kinsler 512 E Mulberry St. Lancaster, Ohio USA 43130 740-687-6368 http://home.earthlink.net/~mkinsler1 _________________________________________________________________ Keep up with high-tech trends here at "Hook'd on Technology." http://special.msn.com/msnbc/hookedontech.armx
This PTG archive page provided courtesy of Moy Piano Service, LLC