Seasonal pitch change:

[John Ross]

All this time, I was thinking that the bass change was less, because those strings were on the bass bridge.
The bass bridge, being at the edge of the soundboard, didn't change as much with the addition/subtraction of moisture, as the other bridge closer to the centre.
I guess I was oversimplifying.
Too bad, I was satisfied all these years, and explained it to my customers, that way.
John M. Ross
Windsor, Nova Scotia, Canada
jrpiano at win.eastlink.ca
  ----- Original Message ----- 
  From: David Andersen 
  To: Pianotech List 
  Sent: Saturday, March 10, 2007 11:23 AM
  Subject: Re: Seasonal pitch change:


  Brilliant, simple, makes sense, and completely expands and clarifies my understanding. Great job, David.  Wish we'd had much more time to hang out in San Fran. You are a crucial resource, dude. Thanks.
  David A.







  On Mar 10, 2007, at 6:40 AM, David Love wrote:
    The lower the tension in a given string the greater the change in pitch for

    a given change in length.  Since the lowest tension tends to be in the low

    tenor, that is where the largest change in pitch generally is.  The bass

    section is usually the highest string tension and therefore changes the

    least.  On many pianos the scale tensions also drop in the upper treble.

    Scales that are designed with more equal tension through the piano will tend

    to go out of tune more evenly.  



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