[CAUT] Thank you for Stability advice

[Ed Sutton]

The Wapin bass string is what I believe we expected to see.
I wish there was a standard bridge video of a bass monochord for comparison.

On C64, I don't see any movement past the bridge pin. 
I wonder if I am seeing the wave move over from a vertical plane to a horizontal plane. Hard to tell.
Watching the full video you can see the treble-most string become out-of-phase with the other two strings.
The impression I get is that the single out-of-phase string is displaced more than the two that stay in phase, that perhaps there is a tendency for the energy to become equalized this way between the two "phases" of the string system.

Ed S.
  ----- Original Message ----- 
  From: PAULREVENKOJONES at aol.com 
  To: caut at ptg.org 
  Sent: Thursday, February 11, 2010 12:18 PM
  Subject: Re: [CAUT] Thank you for Stability advice


  Alan:

  Go to http://real.uwaterloo.ca/~sbirkett/high%20speed%20imaging.htm

  P

  In a message dated 2/11/2010 11:12:15 A.M. Central Standard Time, amccoy at ewu.edu writes:
    Is Stephen Birkett’s video available online? Thanks.

    Alan


    -- Alan McCoy, RPT
    Eastern Washington University
    amccoy at ewu.edu
    509-359-4627 (message Pacific time)
    509-999-9512 (cell Pacific time)



----------------------------------------------------------------------------
    From: <PAULREVENKOJONES at aol.com>
    Reply-To: CAUTlist <caut at ptg.org>
    Date: Wed, 10 Feb 2010 22:24:59 -0800
    To: CAUTlist <caut at ptg.org>
    Subject: Re: [CAUT] Thank you for Stability advice

    I've got all of them and use them regularly in our classes. Vivid indeed!

    P
     
    In a message dated 2/10/2010 10:42:26 P.M. Central Standard Time, fssturm at unm.edu writes:


       
      On Feb 10, 2010, at 9:18 PM, PAULREVENKOJONES at aol.com  wrote:

       

        Thanks, Fred. Admirable attempt to put a difficult  concept into words. Five  Lectures has its uses,  eh?



      Not just Five Lectures, but also the excellent high speed  videography of Stephen Birkett, which makes the theoretical writings visible.  The video he posted of the close up of the Wapin pin is particularly vivid,  showing the "shivering" of the wire at the pin - the various partials  activating it. The bass string videos are also quite helpful for getting the  message that this is, indeed, what happens: a wave propagating from the hammer  blow and reflecting back and forth. 
       
       
       
       
       
      Regards,
       
      Fred Sturm
       
      University of New Mexico
       
      fssturm at unm.edu
       





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