wrote:
> Hi all,
>
> neat topics, I like the double ball point and magnetic axis/pivot/crossed
> rod ideas and have included a rough sketch of a possible arrangement.
>
> http://volcanbaru.com/OSOP/pics/crude_1_third_3_C_seismo.jpg
>
>
> Using the spring would be very traditional and one of many feed back
> mechanism could be used.
>
> I have always been fascinated by floating magnet things and offer this
> page.
>
> http://www.instructables.com/id/Electromagnetic-Floater/
>
> Maybe the spring could be done away with and then use the floating magnet
> for positioning and some finer motion sensor could be used in the feedback,
> maybe like Allan's
>
>
> http://mysite.verizon.net/ressczez/sitebuildercontent/sitebuilderfiles/mkxi.pdf
>
>
> Use three of these arranged orthogonally at 120 degrees to derive all
> three components, like most modern broadband do.
>
> Angel
>
>
>
>
>
Hi Angel and all,
Of course the web is loaded with pendulums articles. One I kind of like for its simplistic graphics
is at:
The servo type levitation web reference below would prove to be "jerky". The same web site
reference above; even references on a "magnetic levitation pendulum"; which uses
pyrolytic graphite and levitates above a arrangement of magnets in a "trap". It "acts" like a
pendulum...but it is more reasonably termed as a tiltmeter; as the mass is so light, that
there isn't much of any enertia component via the mass weight. A fair representation of a
diamagnetic levitation patent (instrument) can be seen on Google; under their patent search feature. Its
patent # 3831287 "Apparatus with adjustable period for measuring small diviations from a
true horizontal plane". Anymore, with long neo magnets and with being polarized correctly
(through the thickness, not the length), its relatively easy to obtain both the magnets and
pyrolytic graphite.....and, one doesn't need all that iron (except for a flat and ~1/4" thick base
plate); as they show on the dated patent. That stuff is a old interest of mine...but....I think
I kind of get bored after awhile and go on to something else...a character flaw I guess....ha.
A earlier model (1968) claims that instrument could clearly see earth tides....but I think
the "rough" variation of the 1974 year model could well do the same.
Meredith Lamb