Changing Harmonicity

[John Ross]

Hi Patrick,
I feel it is more to do with the humidity, being different.
I have noticed the FAC numbers changing with the seasons, on pianos that the
strings were stabilized on.
Regards,
John M. Ross
Windsor, Nova Scotia, Canada
jrpiano@win.eastlink.ca
----- Original Message ----- 
From: "Patrick C. Poulson" <pcpoulso@pacbell.net>
To: "Pianotech" <pianotech@ptg.org>
Sent: Tuesday, March 02, 2004 9:54 PM
Subject: Changing Harmonicity


> Hello All: I have a question about new strings and changing harmonicity,
> which may have been covered before. I retuned an upright that I restrung
> last year. The last time I tuned it I noted down the FAC numbers on the
> service record. I remeasured those numbers today, and they had all dropped
> an average of 2 cents. I wonder if others have noticed this happening, and
> if so, how much change they noticed and an explanation for this
phenomenon.
> I hazard the guess that it has something to do with the stretching going
on.
> This is the 8th tuning I gave the piano after restringing. The last time I
> tuned it was in September, when humidity was somewhat here up in the
Sierra
> foothills. Thanks in advance.
> Patrick C. Poulson
> Registered Piano Technician
> Piano Technicians Guild
>
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