Variation of temperature

[Michel Lachance]

>     Michel,
>     According to Jim Ellis's article in the May, 1995 Journal, p.
>35-6:
>"A rapid drop of four degrees in ambient temperature can cause the piano,
>especially the middle section, to go sharp by about 5.5 cents. A similar
>rapid rise in temperature can cause it to go flat by the same amount. This
>is a transitory effect, and it goes away if the piano is left alone long
>enough for the strings and plate to come to the same temperature."

Thank you very much, it's exactly that kind of information I am looking for.

Michel Lachance, RPT