On Sun, 7 Nov 1999, Marchal van Lare wrote:
> 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?

   The thicker plate will damp more, because its conductivity will be higher.
Another thing you can do to adjust the damping is to cut slits in the copper,
which block eddy currents larger than the distance between two slits from
developing.  This reduces the damping effect.  Other types of cuts will
work also, like simple perforation.  The trouble with this type of damping is
that it is difficult to quantify...you can measure it later on but adjustment
of the damping for fine tuning of the instrument is surely a hassle.  The most
easily adjusted damping is the resistor across coils arrangement.

John Hernlund
E-mail: hernlund@.......
WWW: http://www.public.asu.edu/~hernlund/

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