you're right, I have been, for many years, in charge of the Acoustical R&D Lab of the Leningrad Musical Instrument Industrial Corporation that included a huge piano factory producing about 900 uprights and 140 grands a month. If you look at my web page (URL is given in my signature), you will find more details. Alex At 04:10 PM 7/21/98 +0000, you wrote: >Alex, >How did you do that? Were you working for an R&D department? If so, what >manufacturer? > >At 08:51 AM 7/21/98 -0400, you wrote: >>In seventies, we compared four vertical (120 cm high) instruments of the >>same model, made using the same technology, with two cast iron and two >>aluminum plates. The results were: >>- Tuning changes of the "Aluminum" instruments with temperature was about >>2.5 times larger than for the "cast iron" instruments (that simly follows >>the difference in temperature coefficient for Aluminum and cast iron). >>- After the temperature coming back to the norm, the "iron" instruments >>return back to the initial tuning better than the "aluminum" instruments >>- Basses were deeper and richer in the iron instruments >>- In extreme treble, the color and the intensity of the hammer-string >>"knock" were sistematically different for different material of the frames. >> Alexander Galembo, Ph. D. Acoustics lab, Dept. of Psychology, Queen's University Kingston ON K7L3N6 Canada Tel. (613) 5456000, ext. 5754 Fax (613) 5452499 E-mail: galembo@pavlov.psyc.queensu.ca URL : http://www.geocities.com/CapeCanaveral/Lab/8779/
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