This is a good site for the Watt's linkage:
http://www.brockeng.com/mechanism/Watt.htm
Since this is a mechanical device not thought of by Watt as a pendulum design,
I think we should find out more about von Kamm's contribution.

Cheers,
John

At 05:39 AM 3/15/2003, you wrote:
>All,
>
>I have, as promised, done a little digging into the history of the folded 
>pendulum as a seismometer and here is what I found:

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