Benji,

I've posted details of Chris Chapman's magnetic damping system here:
http://jclahr.com/science/psn/chapman/as1%20damping/index.html
This is for an AS-1 system, but is easily modified for a Lehman.
Chris' Lehman design is shown here:
http://jclahr.com/science/psn/chapman/lehman/index.html

Cheers,
John

At 07:15 PM 8/23/2006, you wrote:
>In a message dated 23/08/06, Benji.Johnson@.................. writes:
>
>>I would like to update my Lehman style seismometer from that of 
>>using oil damping to using resistive damping
>
>
>Hi Benji,
>
>        Electromagnetic damping is easy to adjust and it is not 
> temperature sensitive, or messy.
.... 


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