John F. asked: "Another way of asking: How can we be sure the fork has changed enough to match the coming temperature change of the room?" John, In this modern world, there is a device that has a laser and measures temperatures of anything you point the laser at.<g> I carry one with me to show clients the differences in temperature of sunshine on the piano and such. I got mine at good ole Harbor Freight. The only down side is it eats batteries rapidly. (the buttons get pushed on, etc. with my usual jousting of my tuning kit.<G>) I also use it to varify the temperature of tuning forks that I am callibrating. Best, Joe Joe Garrett, R.P.T. Captain of the Tool Police Squares R I http://gpianoworks.com/
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