[CAUT] False beats

[David Ilvedson]

Ric,

I guess you really are in the future...dude...check out the email date!

David Ilvedson, RPT
Pacifica, CA  94044

----- Original message ----------------------------------------
From: RicB <ricb at pianostemmer.no>
To: caut at ptg.org
Received: 3/27/2007 3:04:37 AM
Subject: [CAUT]  False beats


>Hi Jim.

>    I'm reading the comments about false beats, and I want to add just one
>    more, which does not disagree with anything said so far.  Anything,
>    and I
>    mean ANYTHING, that causes the string's vibration to wander out-of-plane
>    and take on an orthoghnal mode where it's frequency in one plane is not
>    quite the same as in another plane, will cause a false beat.

>    Jim Ellis

>This is exactly my point, and as I read Rons theorizing on all this your 
>statement does disagree in as much as his theory states that by 
>definition a single string beat that responds to sideways pressure of a 
>screwdriver *is* and *always is* caused by flag poling of the pin. Yet 
>observation of such instances reveal that this simply is not  *always* 
>or even nearly so the case. 

>Adding mass to the immediate proximity around the terminate point of 
>such single string beats often, and I mean very often, quiets, slows 
>down, or completely eliminates the beat. But how on earth can that 
>effect whatever flag poling is or isn't happening ?  And why on earth 
>does increased pressure on the screwdriver beyond the point where the 
>beat stops cause it to start up and speed up again ?  Further, for this 
>theory to be correct this particular kind of single string beat (false 
>beat)  simply must always be a result of horizontal in phase movement 
>only. It relies on the bridge pin hole at the surface being oblong in 
>this direction yielding only possibility of movement in that direction. 
>Yet measurements of this kind of thing show that the in phase vibration 
>of the termination can happen in any direction and are not restricted to 
>the horizontal.  In fact there is a whole list of questions that do not 
>find their answer in this absolutist kind of claim.

>Misunderstand me not.  I do not dispute that what Ron says can happen.  
>I dispute that it does happen in this way in the absolute fashion that 
>it is presented.  Which I believe, agrees quite well with your post. The 
>single string false beat, the one that responds to screwdriver pressure, 
>is a result of a more general condition of springyness at the 
>termination as a whole, and not solely because of any specific condition 
>that can contribute to that overall springyness.

>Now I am more then willing to be shown wrong here.  But there are 
>several contradictory phenomena that can be observed that will need to 
>be explained adequately, and not just ignored or simply discounted.  I 
>dont see that it does any of us any good to discover that for years and 
>years we have been under one set of misunderstandings about what false 
>beats are about, only to replace these with another set of 
>misunderstandings.

>Respectfully to all concerned, and as usual Cheers !
>RicB