Doug Crice wrote:

> For example, if you tap the side of a vertical geophone, the mass will
> shake back and forth (as well as the desired direction) at some high
> frequency.

Thanks for the response. I going to add that question to the FAQ soon.

I don't know what set this off, but the I just got another one I can't
answer. I gonna refer him to the list. I think you might be interested
in the subject. Antique instruments.

Thanks again,
Greg

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