[CAUT] temperature and pitch

[Don]

Hi Fred,

And what was the relative humidity? Had it changed too?

Did you see a pattern in the unison smearing? I.e. was the bass side of the
unison out in a different pattern than the treble side of the unison?

At 09:17 AM 12/11/2009 -0700, you wrote:
>	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
Regards,
Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T.
Non calor sed umor est qui nobis incommodat

mailto:pianotuna at yahoo.com	http://www.donrose.ca/

3004 Grant Rd. REGINA, SK, S4S 5G7
306-539-0716