Viewing vibrating strings in front of monitor

[Richard Moody]

OOPs  I read your response to the list after I compsed this. 
Feel free to add svp.  rm 


> PS - Not much response to my posting about developing a REAL "Piano
> Strobe Light"

Hi Alan, 
	Don't remember your posting about a real piano strobe light.   I would be
intersted if you would re post and  go into more detail. 

Yes the flatness of a rubber band as it "yaws" (I hope right term)
detracts from the partial divisions. And in double florusent lights one
wonders what one sees.  
However, "strobe lights" I think are more availiable to experinenters than
 before, it would be intersting to look at vibrating piano wires in such
"light"

Richard Moody 

----------
> From: Alan W Deverell <aland@casa.co.nz>
> To: Piano Tech <pianotech@ptg.org>
> Cc: Mrs D McNeil <dmcneil@mail.newcastle.edu.au>; Singleton, Roy RXS
<roy.singleton@bellgully.co.nz>; Richard Moody <remoody@easnet.net>
> Subject: RE: Viewing vibrating strings in front of monitor
> Date: Tuesday, August 25, 1998 4:35 PM
> 
> Richard & Others,
> 
> I agree that a conventional rubber band, while displaying fundamental
> properties of a tensioned element, will not accurately represent the
> STEEL string and the inherent inharmonicity etc. You could try a piece
> of "O" ring material of small diameter (this can be bought from
> engineering supply shops) - this is at least "round" and would not
> abberate the effects like a flat or square section rubber band and NOT
> have significant aerodynamic characteristics.
> 
> Ideally the string needs to be "HIT" (rather than plucked) with a felt
> hammer if you are to invoke the "piano" response in the tensioned
> element. The striking point would be significant.
> 
> It is probably much easier to adjust the resonance of the
> string/band/o-ring to synchronize with the computer monitor than go
> through the procedure of changing the VGA settings etc. and probably
> more appropriate to use a fluorescent light anyway.
> 
> A fluorescent light with TWO tubes is normally set up to strike each
> tube 180 deg out of phase with each other. This would then STROBE at
> 120HZ (or 100Hz in civilised places like New Zealand etc.):-)). Just
> remove one tube to get 60Hz (or 50Hz).
> 
> AlanD (still trying to see what he can hear - and taking a fluorescent
> tube home to try this out tonight on a real piano)
> 
> PS - Not much response to my posting about developing a REAL "Piano
> Strobe Light"
> 
> >-----Original Message-----
> >From: Richard Moody [mailto:remoody@easnet.net]
> >Sent: Wednesday, August 26, 1998 1:07 AM
> >To: aland@casa.co.nz
> >Subject: Viewing vibrating strings in front of monitor
> >
> >
> >Hi Alan
> >	Thanks for the input.  While I am not sure about the
> >freqs of monitor
> >screens, I am sure that rubber bands is NOT a good model, as
> >I suggested.
> > They are flat, and it seems the flatness "warps" its plane and thus
> >distorts the slow motion partial movements when viewed
> >against a screen.
> >
> >It will be a while before I can get a piano wire stretched across the
> >screen, but that is what I am aiming at.
> >
> >Richard Moody
> >
> >
> >
> >----------
> >> From: Alan W Deverell <aland@casa.co.nz>
> >> To: Piano Tech <pianotech@ptg.org>
> >> Subject: FW: Inharmonicity
> >> Date: Monday, August 24, 1998 4:30 PM
> >>
> >> Viewing a stretched and plucked rubber band under fluorescent
> lights
> >> and/or a Multiscan SVGA monitor sounds like a novel way to simulate
> >> vibrational behavior in a tensional element ?
> >>
> >> By running various, 50~90Hz, vertical re-fresh frequencies a range
> of
> >> synchronous conditions could be simulated. Some "high-end" display
> >> monitors even support vertical refresh frequencies above 100Hz.
> >>
> >> Warning - caution must be taken in adjusting the vertical refresh -
> >> DON'T select settings that are NOT supported by your Graphics Card
> or
> >> Monitor - there are some monitor diagnostic utilities about which
> may
> >> be used to momentarily select various resolutions etc.
> >>
> >> AlanD