Chris--
=20
  I purchased #38 wire (Low temperature  (105=B0C, NEMA STD MW-1-c) enamel=20
coated magnet wire) on quarter-pound  spools for $7.50 off from Alltronics.c=
om. It=20
is diamagnetic. I believe that if a  wire is fabricated from OFHC copper, it=
=20
will be diamagnetic, but I do not know  anything about this particular wire=20
except that it is cheap and has a very low  temperature rating.
=20
  In an attempt to answer Jack Ivey's question, a  diamagnetic coil in my 4=20
pole magnet structure experiences a decentering force,  which makes stable=20
adjustment of natural period very difficult. Imbedding  the coil in a thick=20
diamagnetic sheet of plastic of transverse dimensions larger  than the magne=
tic=20
field region reduces the diamagnetic pull exerted on the coil  by the gradie=
nts of=20
the field reversal and the edge fields of the magnet.
=20
Bob





Chris--
 
  I purchased #38 wire (Low temperatur=
e=20
(105=B0C, NEMA STD MW-1-c) enamel coated magnet wire) on quarter-poun=
d=20
spools for $7.50 off from Alltronics.com. It is diamagnetic. I believe that=20=
if a=20
wire is fabricated from OFHC copper, it will be diamagnetic, but I do not kn=
ow=20
anything about this particular wire except that it is cheap and has a very l=
ow=20
temperature rating.
 
  In an attempt to answer Jack Ivey's question, a=20
diamagnetic coil in my 4 pole magnet structure experiences a decentering for=
ce,=20
which makes stable adjustment of natural period very difficult. Imbeddi=
ng=20
the coil in a thick diamagnetic sheet of plastic of transverse dimensions la=
rger=20
than the magnetic field region reduces the diamagnetic pull exerted on the c=
oil=20
by the gradients of the field reversal and the edge fields of the magnet.
 
Bob