Charles Patton,

WoW!  You hauled in some very good material to
ponder over.  I have to say I don't understand it
all.

I hear this "POCO" graphite seems to have unique
properties, but as yet, exactly what it is I don't 
know.  How it racks up to "standard" graphite is
a unknown.  I've also read there is some 12 million
combinations of carbon with the other elements.
Maybe their manufacturing process somehow differs
from the others?

From my expeditions to surplus outlets, its kind
of a gamble on whether the stuff you get is 
diamagnetic or not.  Anymore, I take along a nice
thick piece of neodymium for testing on the spot.
If its a piece of DC motor commutator brush, I
hold the cable end lightly, and see the reaction
of the carbon/graphite fairly well.  Carbon rods
can be tested simarily by lightly holding the end,
or a short length of scotch tape can help. 

Have run into pieces where one end is paramagnetic,
and the other end is diamagnetic.  One never knows.
Likewise, I've seen same carbon manufacturers, but
their products can have varying responses, from
one piece to the next.  I used to think it was the
manufacturer, but, anymore, one has to also consider
the possibility of the material being somehow
subjected to varying elements, and internal variance
factors that make or break; the ideal diamagnetism.
Speculation....  Its doesn't seem like their is any
guarantee whatsoever, on what one gets, from any
source.

Another factor I had misconceptions on:  The color
of the graphite tells very little about its
diamagnetism...test them all, whether very black,
or grayish black. 

Thanks for the huge effort.  I especially like the
tables, as my nearest library doesn't have such.

Thanks,  Meredith Lamb



 



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