Marchal van Lare wrote:

> Hi all,
>
> For a long time I considered to use oil to damp my Lehman.
> I find it a quite messy business though.
>
> I want to use copper plate damping. I suppose the thinner the plate,
> the more damping it gives. Is this correct? Does the size of the plate
> matter?
>
> May be anyone knows other ways to dampen a seismograph?
>
> Thanks in advance.
>
> Best regards,
>
> Marchal van Lare
> -Nieuwvliet, The Netherlands
> _____________________________________________________________________

Damping occurs with the copper plates due to the current generated in the
plates by the magnetic field. Thinner plates will have a higher electrical
resistance and hence less current and hence less damping. Actually the
difference is small enough to not worry about the thickness of the plates.
The plate needs to big enough to intercept the magnetic field of the magnet
you are using for the damping or just a little larger than the magnet. The
amount of damping can be adjusted by changing the distance from the plate
to the magnet or magnets.

--
Jim Hannon
http://soli.inav.net/~jmhannon/
42,11.90N,91,39.26W
WB0TXL



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