Marchal,

Congratulations on completing your system.  I too have built a Lehman and used it in both a crawlspace and vault environment.  
My crawlspace was rather damp as well.  I dug down a foot and built a concrete pad for the system but kept the electonics in th
e house but as close as possible.  You might consider sealing the concrete to prevent moisture transmission. I also covered the
 seismometer with a box made of insulating foam that gave some level of moisture protection and good temperature control.  If t
he unit you made is the typical one of galvanized pipe and oil damping, it will survive almost any assalt.  If the base tips ov
er time, merely relevel the unit.  Have fun, it's a great hobby.  

Dick Webb
Raleigh, NC, USA
PSN-L Mailing List  wrote:
> Hi all,
Last July I asked your advice in building a Lehman. Thanks to the
advice you gave me, I have completed the project. I will use Larry's
equipment to start recording in the near future.

Now I have to find a good location to place my Lehman. I have
two options: to place it in a separate room or in the crawlspace =

beneath the house.

There is not much room in the crawlspace (1 meter) and the soil
consists of sand and clay. Sometimes (after wet weather conditions over
a long period of time) there is also the problem of water in it.

I guess a pier will tilt due to the different soil conditions?

What do you suggest?

Thanks in advance,

Marchal van Lare
-Nieuwvliet, The Netherlands




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