Date: Tue, 15 Feb 2011 21:04:09

Author: Simcha Segev

Subject: Re: waves on a string


Yes, its look like an interference pattern of the camera and string but
anyway, it's a Fabulous video.
Thanks to marty, Simcha

-----Original Message-----
From: [] On
Behalf Of Paul Nord
Sent: Tuesday, February 15, 2011 4:37 PM
Cc: Paul Nord
Subject: Re: [tap-l] waves on a string

Re: yesterday's discussion of camera shutter speed
Note the bright direct sunlight and the high contrast between the strings
and the fingerboard.

This is happening faster than the shutter speed, as you said. It's sort of
an interference pattern between the scan lines on the CCD and the motion of
the strings.

Fantastic video, Marty. Thanks for sharing.


On Feb 14, 2011, at 11:26 PM, Martin Simon wrote:

> Sorry to reply to my own post but now I see it is just an
> artifact of the camera shutter that looks like a higher
> harmonic, but really isn't. It must be oscillating in
> the fundamental mode.
> I remember getting fooled by something similar at
> the exploratorium. Still, it's a nice effect.
> Marty
> On 2/14/2011 8:48 PM, Martin Simon wrote:
>> This video surprised me, because of all of the higher harmonics
>> visible. When I look at bowed cello strings, they vibrate in the
>> fundamental mostly, unless the cellist makes it otherwise.
>> But these plucked base strings look totally higher harmonics.

From Tue Feb 15 16:13:53 2011