FW: Inharmonicity

[Alan W Deverell]

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

-----Original Message-----
From: owner-pianotech@ptg.org [mailto:owner-pianotech@ptg.org] On
Behalf
Of Richard Moody
Sent: Sunday, August 23, 1998 6:14 PM
To: pianotech@ptg.org
Subject: Re: Inharmonicity


Jim,
	Interesing to look at the rubber band from the end.
And you have wondering if a program can be done in BASIC that makes
the
monitor act like a strobe light?

Richard Moody

----------
> From: Jim Coleman, Sr. <pianotoo@imap2.asu.edu>
> To: Richard Moody <remoody@easnet.net>
> Cc: pianotech@ptg.org
> Subject: Re: Inharmonicity
> Date: Friday, August 21, 1998 5:33 PM
>
> Hi Richard again and again:
>
> You gave me a good idea about using a rubberband under florescent
lights.
> You can vary the tension until you find frequencies which are
multiples
> of the 60Hz alternating current. You can seen the complex waves. You
can
> also see that the band does not vibrate in a circular motion, but in
a
> motion more or less in line with the direction of your plucking.
That is
> similar to struck strings in a piano. If you turn of the lights and
hold
> the rubber band pointing toward the computer monitor, you can see
various
> parials in operation. Thanks for the idea. It doesn't work exactly
like
> a variable strobe light, the light is constant, but you can vary the
> tension and the amplitude.
>
> Jim Coleman, Sr.