In a message dated 21/01/03, meredithlamb@............. writes:

> 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 
> 

Hi Meredith,

       I get an 'We can not find the file....' when I click on the above. If 
you copy the text to Web Address it works, but you then need to click on 
'Papers'.
       Ceramic magnets have relatively low fields and are quite temperature 
sensitive. They are often fitted with soft iron cap plates to enable the 
field to be concentrated, such as in loudspeaker applications.

       Regards,

       Chris Chapman
In a message dated 21/01/03, meredithlamb@............. writes:



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. 



Hi Meredith,



       I get an 'We can not find the file....' when I click on the above. If you copy the text to Web Address it works, but you then need to click on 'Papers'.

       Ceramic magnets have relatively low fields and are quite temperature sensitive. They are often fitted with soft iron cap plates to enable the field to be concentrated, such as in loudspeaker applications.



       Regards,



       Chris Chapman