pitch changes in long sustain

[Jim Coleman, Sr.]

HI Richard:

The change of beat speed beat speed of the F3-A5 is heard only in the
first second, not in the long term.

When Shuck and Young did their experiments, their machine only measured
to 1 cent. The machines today measure .1 cents. They were not tuners
who were used to listening to beats.

JIm Coleman, Sr.

On Fri, 28 Jan 2000, Richard Moody wrote:

> Hi Jim, 
> 	Thanks for the reply. 
> 	 I have never noticed "pitch lowering" in piano
> strings over a period of time.  Listening to F3-A5 I can't say I
> hear the beat slowing.  Now that you mention it , it might be if I
> listen for 8 or 10 seconds.  But I never listen to thirds or
> tenths, for 4 seconds, 5 at the most.      
> 	I am wondering why this did not come up in the experiments of
> Young and Schuck. ("Observations on the Vibrations of Piano
> Strings" JASA Vol 15, No 1, July, 1943)  Perhaps their instruments
> were not sensitive enough in 1943?  This is the kind of phenomenom
> that should be right up the alley of the Acoustical Society of
> America.  I wonder if any articles have been published on it?  
> 	I have to keep an open mind on this though, because I hope I am
> not the first to admit that in tuning a 10th (to a Third)  in the
> bass, once in a great while, I have gotten the tenth rate a little
> better on the wrong pin.  ; )   Wrongoneric
> 
> 
> 
> ----------
> > From: Jim Coleman, Sr. <pianotoo@imap2.asu.edu>
> > To: Richard Moody <remoody@midstatesd.net>
> > Cc: pianotech@ptg.org
> > Subject: Re: Unison coupling
> > Date: Thursday, January 27, 2000 2:06 AM
> > 
> > Hi Richard:
> > 
> > The change in pitch of the middle and low end of the piano is
> negligible 
> > in repect to time especially when you are listening to beats.
> However,
> > in the 5th and 6th octaves, one can hear the difference in the
> faster 
> > beating intervals such as 10ths etc. Play F3 and A5 together.
> Since the
> > F3 does not change much in respect to time, the slowing of the
> beat in
> > this interval of a 17th is due to the fact that the A5 is
> dropping in
> > pitch. This is easily seen on  the SAT, but you can also hear it.
> The
> > change is more rapid at first than later.
> > 
> > Jim Coleman, Sr.
> > 
> > 
> > 
> 
>