Jerry,
they are magnitized through the thickness.  I order mine through K&J =
Magnetics at http://www.kjmagnetics.com
The part number is=20
BX0X02
1" x 1" x 1/8" thick
Grade N42 - Nickel Plated
Magnetized thru Thickness

Hope this helps.
Kay



  ----- Original Message -----=20
  From: GPayton=20
  To: psn-l@.................
  Sent: Thursday, July 22, 2010 8:30 PM
  Subject: Chapman's sensor Design



  Looking closely at the drawings on this page, I am not certain about =
the magnetization of the required sets of magnets.  Are they magnetized =
from end-to-end or through the thickness?

  Most magnets I have found online, so far, have been through the =
thickness, but I am not sure what is shown on the drawing.  Anyone know?
  Thanks,
  Jerry

-------------------------------------------------------------------------=
-----


    Here is the link to Chris Chapman's coil design and instructions
    http://www.jclahr.com/science/psn/chapman/lehman/index.html







Jerry,
they are magnitized through the =
thickness.  I=20
order mine through K&J Magnetics at http://www.kjmagnetics.com=

The part number is 

BX0X02
1" x 1" x 1/8" thick
Grade N42 - Nickel =
Plated
Magnetized thru=20
Thickness
 
Hope this =
helps.
Kay
 
 
 

  
----- Original Message ----- 
  From:=20
  GPayton=20
  
  
To: psn-l@.............. 
  
Sent: Thursday, July 22, 2010 =
8:30=20
  PM
  
Subject: Chapman's sensor =
Design
  


  
 
  
Looking closely at the drawings on this page, I am not certain =
about the=20
  magnetization of the required sets of magnets.  Are they =
magnetized from=20
  end-to-end or through the thickness?
  
 
  
Most magnets I have found online, so far, have been through the=20
  thickness, but I am not sure what is shown on the drawing.  =
Anyone=20
  know?
  
Thanks,
  
Jerry
  

  

  
  
    
 
    
Here is the link to Chris Chapman's =
coil design=20
    and instructions
    
http=
://www.jclahr.com/science/psn/chapman/lehman/index.html