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Subject: Another size diamagnetic pencil lead that works.
From: meredithlamb meredithlamb@.............
Date: Tue, 11 Jun 2002 15:12:42 -0600

Hi Chris and all,

Evidently there is a number of pencil "refill" or "propelling"
leads that are diamagnetic.  I couldn't find the Faber Castell
2B leads you mentioned right off in Denver.  However, I
did luck out with a Faber Castell "super polymer", code: 1.4B,
that is also diamagnetic.  Its 1.4mm or ~ .053" in diameter x
60mm or ~ 2.395" long.  Black plastic case with a green
plastic cap atop the case which holds 6 leads.  Price here,
around $3.25, but from a independent art supply retailer.
All the leads seemed to be levitating equally in height or
distance from the magnets...but of course, theres no 
quarantee that the manufacturer is really consistent in the
graphite purity of product. 

Got immediate levitation with a 8 magnet assembly here, but
of course with a short period ~ 1.5 to 2 seconds.  I tried a
6 magnet assembly with a lead, but the lead looks like it
needs to either be cut down in length, or, perhaps a added
weight "might" help with a centering/oscillating and levitating

I also tried putting two leads side by side and levitating on a
8 magnet assembly, and that also works.  Not as much lift
spacing between the leads and magnets of course, but the
oscillation period seemed to slightly increase to ~ 2-3 seconds.
The 2 leads levitated as a platform of equal height...convenient
for any light/photo cell aluminum "flag" mounting, and/or
damping medium.

Haven't tried it yet, but having 3 leads together could also
possibly work.  From the ends view they might look like
a triangle (of circles).  That arrangement might need clearance
sanding....but it might also be too heavy?  (This approach
is very light fly weight)

Most interesting; thanks James and Chris!

Take care, Meredith Lamb


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