Hi Jim,

Thanks (!) for the reference too:

http://ojps.aip.org/tpt/

For those curious, click on February 2003, and go to "More
Diamagnetism Demonstrations" written by Chris Conery.  It has
either standard HTML or Adobe PDF versions available.

I note they use some of the best diamagnetic pyrolytic graphite
known and likely their levitated magnet is also highly rated at
a MGOe of very likely 45.  It "used to be" that this pyrolytic
graphite could only be obtained at a very high cost (~$400, for a
6" x 6" x ~ .1" thick piece!).  They DO take a unusual
step with using the ceramic magnets, to the sides of the levitated
magnet.....one could use a single magnet that is height adjustable
(although this might be somewhat in the way of the view of the
surface).  The fluid actually helps the magnet levitate higher than
normal.

Their approach actually seems to entail a number of additional
items to produce the same effect that John Lahr's considerably
more simplified version demonstrates.  See:

http://jjlahr.com/science/physics/diamag/water/

Actually, this water diamagnetism hasn't heretofore been as
well demonstrated as via these 2 web sites that I'am aware
of.  The newer and better material available has made some
of these demonstration units much more feasible to do, or try.
Congratulations to the innovative builders!

Take care, Meredith Lamb

Connie and Jim Lehman wrote:

> PSN people---those interested in diamagnetism and possible seismic
> sensor applications may find the recent article in Feb. '03, "The
> Physics Teacher" helpful----a horizontal version of the previous
> vertical design---                                      Jim Lehman



Hi Jim,
Thanks (!) for the reference too:
http://ojps.aip.org/tpt/
For those curious, click on February 2003, and go to "More

Diamagnetism Demonstrations" written by Chris Conery.  It has

either standard HTML or Adobe PDF versions available.
I note they use some of the best diamagnetic pyrolytic graphite

known and likely their levitated magnet is also highly rated at

a MGOe of very likely 45.  It "used to be" that this pyrolytic

graphite could only be obtained at a very high cost (~$400, for a

6" x 6" x ~ .1" thick piece!).  They DO take a unusual

step with using the ceramic magnets, to the sides of the levitated

magnet.....one could use a single magnet that is height adjustable

(although this might be somewhat in the way of the view of the

surface).  The fluid actually helps the magnet levitate higher
than

normal.
Their approach actually seems to entail a number of additional

items to produce the same effect that John Lahr's considerably

more simplified version demonstrates.  See:
http://jjlahr.com/science/physics/diamag/water/
Actually, this water diamagnetism hasn't heretofore been as

well demonstrated as via these 2 web sites that I'am aware

of.  The newer and better material available has made some

of these demonstration units much more feasible to do, or try.

Congratulations to the innovative builders!
Take care, Meredith Lamb
Connie and Jim Lehman wrote:

PSN
people---those interested in diamagnetism and possible seismic sensor applications
may find the recent article in Feb. '03, "The Physics Teacher" helpful----a
horizontal version of the previous vertical design---                                     
Jim Lehman