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. > >Alex Vince Mrykalo RPT MPT IPT BA HA HA ~~~~~~~~~~~~~~~~~~ vince@byu.edu
This PTG archive page provided courtesy of Moy Piano Service, LLC