Thanks for posting the link Deborah. Very informative web page.

Regards,
Larry Cochrane
Redwood City, PSN

On 2/25/2013 11:59 AM, Warner, Deborah J. wrote:
> For an historical account of the Sprengnethers and their seismographs, see
>
> http://www.erittenhouse.org/artitcles/sprengnethers-and-their-seismographs/
>
> Deborah Warner
>
> Curator, Physical Sciences Collection
>
> National Museum of American History
>
> Smithsonian Institution
>
> Washington, D.C. 20013-7012
>
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