string termination

[Geoff Sykes]

You've discovered nodes. And as I think about them, and how they relate to
the fundamental, or first partial, I'm wondering if given the point at which
the hammer actually strikes the string, (a point selected to create the
highest number of partials actually related to the fundamental), if the
fundamental is actually the loudest frequency we are hearing. Obviously it
is, but in theory I would think that the further away you get from the
center of the string, the weaker that fundamental "should" be. But maybe
that only applies to plucking, (creating the phenomena Joe describes on his
bass), and not striking. Just curious.

Geoff Sykes
Assoc. Los Angeles



-----Original Message-----
From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On Behalf
Of Joe And Penny Goss
Sent: Saturday, August 13, 2005 5:42 PM
To: Pianotech
Subject: Re: string termination


Well Carl,
If you wants common cents <G>
When I's plucks my bass pulling the string in a up motion on my bass I gets
a ping sound. If it is pulled to the side, more of a deep full bassey sound.
But that is probibly not the kind of answer you are after. Also the same
kind of results of a sort if the string is excited near the bridge, a thin
sound. And away from the bridge a deeper fuller sound. Your search may raise
more questions for you. Hope you can find your answer. Joe Goss RPT Mother
Goose Tools imatunr@srvinet.com www.mothergoosetools.com
----- Original Message ----- 
From: "Carl Meyer" <cmpiano@comcast.net>
To: <pianotech@ptg.org>
Sent: Saturday, August 13, 2005 6:12 PM
Subject: string termination


> A lot of things about string terminations have bugged me for some 
> time.
>
> Ron Overs (who I respect) promotes hardening of the capo bar, yet the 
> agraffe is a relatively soft material (brass).  The difference is that 
> the capo is straight and the agraffe is round.  Wouldn't the agraffe 
> last
longer
> if it were heavily plated with chrome, nickel or??  Oh I forgot, piano
techs
> love brass, felt and wood.
>
> Now under normal circumstances, the piano string is terminated 
> (pivoted)
on
> the top surface of the agraffe.  Let's call that North.  Let's call 
> the bottom of the agraffe South.  The other two surfaces would be 
> called east and west.
>
> At the bridge, the string is terminated at maybe SSE (south south 
> east).
>
> Wapin claims that their vertical bridge pin encourages the string to
vibrate
> in the horizontal direction quicker before the energy has been 
> dissipated
in
> the vertical mode and hence -longer sustain.
>
> Let's make it a given that the impact of the hammer is in a northern 
> direction.
>
> Stuart of Australia claims that their bridge termination increases the
> vertical vibration of the string.   Hmmmm?  How does that effect the
> sustain????
>
> My esteemed colleuge from one of the fly over states suggests that a
string
> starts out vibrating vertically, slowly starts to drift horizontally 
> but never gets to true horizontal.  He also suggests that a string 
> tends to vibrate at 90 degrees of its termination.  I want to find out 
> if that is true.
>
> I don't really know, but it has been my assumption (maybe in error) 
> that
the
> string vibrated vertically, slowly drifts elliptically, approaches 
> horizontal, then elliptically in the other direction and then returns 
> to vertical at a much lower level.  This would then be a cyclical 
> phenomenon. Sorry for the flurry of five dollar words.
>
> I've been thinking of a new bridge termination scheme for rebuilding  
> but I'm not going to proceed till I answer a basic question.
>
> Here's my question:  A vibrating string has two terminations.  It is
excited
> in the northern direction.  (Ignore the strike point)  What effect on 
> tone will be the termination of the two ends of the string????? Both
north, one
> north and the other south, east or west????   Or no big difference??
>
> I have recently found plans on the net to build an led stroboscope.  I
will
> build this and look at a string under vibration. I could stretch a 
> wire across my garage and look at it with different terminations.
>
> If some of you deep thinkers have an answer to my question that makes
common
> sense, I won't have to do this.  Give me your feedback.  Thanks
>
>
>
>
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