PSN-L Email List Message
Subject: Re: Food for thought; round glass objects on flat glass, as seismometer
From: Dave Youden dyouden@.............
Date: Wed, 09 Nov 2005 16:34:51 -0500
I suggest that you try sapphire or ruby balls from Small Parts Inc (
www.smallparts.com) For a couple of bucks apiece you can get grade 25
balls that are highly polished and round to within .000025". These are
used commercially as indicator tips and probes for coordinate measuring
machines. They have excellent physical properties as well.
meredith lamb wrote:
> Hi all,
> Haven't yet tried such; but it is obvious that there are various size
> glass round balls
> around that could (?) be tried as a dual spaced pivot part of a seismo
> hinge. The
> contact surfaces for such could also be a flat glass, or of course, a
> variety of other
> materials. Probably for weight pressure limitations they may best
> work for S-G's
> (vertical hanging mass pendulums), with lighter overall boom/mass weights.
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