Hi Chris,

John Lahr noted this web address correction:
 http://ojps.aip.org/journals/doc/PHTEAH-ft/vol_41/iss_2/74_1-div0.html

He also noted that links for other versions are on this page:
 http://ojps.aip.org/dbt/dbt.jsp?KEY=PHTEAH&Volume=CURVOL&Issue=CURISS

The "Physics Teacher" server seems to be quite slow to respond.

I agree on your magnets statement; and....yes, they may need a
added mechanical arrangement for the temperature ranges
changes that can occur.  For that "general" arrangement, only
a temperature change of only afew degrees can have a big
levitation height change in position.

Your iron sheet add-on idea with other diamagnetic setups
involving seismic designs is quite a excellent and dramatic
improvement, where its possible to do so.

Take care, Meredith

ChrisAtUpw@....... wrote:

>
> 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


Hi Chris,
John Lahr noted this web address correction:

 http://ojps.aip.org/journals/doc/PHTEAH-ft/vol_41/iss_2/74_1-div0.html
He also noted that links for other versions are on this page:

 http://ojps.aip.org/dbt/dbt.jsp?KEY=PHTEAH&Volume=CURVOL&Issue=CURISS
The "Physics Teacher" server seems to be quite slow to respond.
I agree on your magnets statement; and....yes, they may need a

added mechanical arrangement for the temperature ranges

changes that can occur.  For that "general" arrangement, only

a temperature change of only afew degrees can have a big

levitation height change in position.
Your iron sheet add-on idea with other diamagnetic setups

involving seismic designs is quite a excellent and dramatic

improvement, where its possible to do so.
Take care, Meredith
ChrisAtUpw@....... wrote:
 

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