On Fri, 24 September 1999, John Lahr wrote:

> 
> Hi Meredith,
> 
> On another list I was introduced to static magnetic levitation.  There
> is a link to the demo I built on this page:
> http://lahr.org/john-jan/handson/
> 
> I had this device at the USGS open house and should have shown it
> to you then!
> 
> JCLahr

Hey John....your web site and and Simon Quellen's site,
were just fantastic to review!  I never forgot the first
time at your then, rented house in Golden, with your magnetic spinning top hovering in the air some 5-6 inches above magnetic b
ase...it made the whole group go silent with
facination!!

I suppose in the back of everyones minds, comes the
questions involving using the neodymium magnet as a
seismic sensor, or vague environmental magnetic field magnetometer.  With it, the questions of maximum and
minimum sizes of magnets involved and in particular the
allowable mass of the neodymium magnet.  Simon Quellens
web site, showed a picture of a stable/static neo which:
"bobs and spins in the wind from the viewers's breath",
which implied some neo/mass allowable movement, from the
rest of the "frame structure".  Now I wonder if a Hall
sensor/s could find some application here; even though
the "period" would likely be short period.  Sounds kind
of far fetched, but, it almost sounds very possible, if
for nothing more than a newer and unique approach.

Looks like I'll have to thoughly check out your site
much more often, in the future....

Thanks for the reply and references; very interesting!

Meredith Lamb

    

 


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