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> This discussion made me think of what a bowl would sound like and > what frequencies could be generated by making some sort of pneumatic > device that would hold the bowl (small suction cup at the bottom?), > and spin a dowel around the lip, and you could vary the speed of > rotation, and the pressure applied to the bowl. This is very much like the instrument that Benjamin Franklin invented...the Glass Armonica. There is a great picture of it here: http://www.glassarmonica.com/ and a great sound file here: http://www.crystalmusic.com/ Mike McGary