I highly recommend the following magnets:
 
_http://www.gaussboys.com_ (http://www.gaussboys.com) 
Block  #18 
Shape: Block 
Size: 50mm x 18mm x 6mm 
Plating: Nickel 
Surface  Gauss: 2900 
Material Grade: N38 
Strength: 70 lbs 
Price: $5.00  each
 
Place pairs on quarter-inch or thicker steel plates and hold the plates  
apart with stove bolts. Assemble very carefully, using a thick shim to hold the  
gap, and then jack the gap open with the bolts to release the shim. Wear heavy  
gloves! For a gap of 0.250 inches, you get a field of 8000 gauss. A 
rectangular  coil of 1100 turns yields 85v-s/m output. You won't need separate damping  
magnets. A shunt resistor will provide the damping.
 
Bob





  I highly recommend the following magnets:
 
http://www.gaussboys.com
Bl=
ock=20
#18 
Shape: Block 
Size: 50mm x 18mm x 6mm 
Plating: Nickel 
Sur=
face=20
Gauss: 2900 
Material Grade: N38 
Strength: 70 lbs 
Price: $5.00=20
each
 
Place pairs on quarter-inch or thicker steel plates and hold the plates=
=20
apart with stove bolts. Assemble very carefully, using a thick shim to hold=20=
the=20
gap, and then jack the gap open with the bolts to release the shim. Wear hea=
vy=20
gloves! For a gap of 0.250 inches, you get a field of 8000 gauss. A rectangu=
lar=20
coil of 1100 turns yields 85v-s/m output. You won't need separate damping=20
magnets. A shunt resistor will provide the damping.
 
Bob