[pianotech] pitch and temperature

[Ron Nossaman]

On 1/9/2011 2:28 PM, Gene Nelson wrote:
> Curious if anyone knows of a reasonably accurate method to predict pitch
> change in a piano based on temperature change?
> Gene Nelson

Gut Nichols had a system he liked, but I don't remember his numbers off 
the top. The problem is that it's time dependent. It might change 2¢/°F 
on a minute by minute basis under stage lights, but in the long run it 
doesn't seem to make a tremendous difference. Short term, the strings 
react first. Give the plate time to catch up, and the overall difference 
isn't that much. I've tuned in homes where the tuning changed back and 
forth as the furnace cycled.
Ron N