John Finke wrote:

> All,
>
> I would like to know if anyone has available schematic diagrams for the Lehman seismograph construction.  I understand a grea
t deal of the mechanics for such an instrument however my knowledge of electrical systems and components is limited to the bene
fits of light switches and the like!
>
> I have CAD capabilities (microstation or AutoCAD) so if electronic files are available I would appreciate it if they could be
 forwarded.  If hard copies are available I will send a SASE and gladly pay for any reproduction cost.
>
> Thank you.
>
> Regards,
> John Finke, P.E., S.E.
> finkeje@............
>

Hi John,

A number of "Lehman" seismometer related articles and drawings
is already available on the PSN web site, you can download and
review.  See:

http://psn.quake.net/infoequip.html

"Often", individually one has to adapt whatever material they "can"
obtain or convert for use in relation to this type of instrument.
There is other approaches that seem to be better (or more
complicated), but they may yield better results.  Personally, I'd
suggest a more simplified version of the Shackleford-Gunderson
horizontal seismometer as a better approach for a "first
seismometer", and then if you're up to it; perhaps trying the
more complicated versons later.  Of course, this is only a
suggestion.

Meredith Lamb


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