PSN-L Email List Message

Subject: Re: Seismograph
From: meredith lamb psnseismograph52@..........
Date: Fri, 09 Jul 1999 11:13:59 -0600




robert barns wrote:

>
>   I think that using a ball end (say 1/8" dia.) or
> a disk is easier.  I have put a photo of my pivot which uses a disk (about
> 1 1/2" in dia.) on my web site.     www.webspan.net/~bbarns
> The disk simply rests on a flat brass bar.  This makes it easy to position
> the contact since it can be anywhere on the bar.
>   Many hardware stores carry 1/2" dia. aluminum rod.  I think that this is
> good for the boom.
> Bob Barns
>

Bob,

Went to your web site and saw the pivot.
Your disk roughly resembles a glass cutter metal disk.  I presume
its like a washer put in a drill press collet with a bolt/nut attachment
and filed down as it was spun?

Meredith Lamb



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Larry Cochrane <cochrane@..............>