[CAUT] temperature and pitch

[Fred Sturm]

	This morning I had the opportunity to see a pretty precise picture of  
what temperature change does to pitch. I tuned a Steinway A (old,  
rebuilt) yesterday in a performance space, and came back this morning  
to tune it again (two night show). The temperature today was about 10  
degrees F lower than yesterday (heat turned down overnight). The  
tuning was as expected for a next day (unison tweaking), but the pitch  
was pretty consistently 2 cents sharp throughout. Tenor was maybe a  
bit less (1 - 1.5), but otherwise quite consistent. The piano had  
obviously cooled down slowly overnight, and was stable.
	So there you have a field observation under more controlled  
conditions than we usually see, for the record. (I tuned it where it  
was).
Regards,
Fred Sturm
University of New Mexico
fssturm at unm.edu