PSN-L Email List Message

Subject: Re: Seismograph
From: Marchal van Lare vanlare@..............
Date: Sun, 4 Jul 1999 14:52:40 -0400


Hi,

My Lehman looks much like the one described in the Scientific
American article. =


The main frame doesn't consist of pipes, but I used metal bars =

instead. The piano wire is directly attached to the upper main =

frame. I didn't use a turnbuckle.

The boom is a curtain rod of ~ 75 centimeters long. The problem
is, I can't get the boom in a center position. I didn't get much
farther. Perhaps the soft soil I live on (clay and sand) causes =

the boom proble,?

Meredith, you say the SG sensor isn't that much of a problem to
build, even for someone who has problems with the simple 'Lehman'?
:)

Best regards,

Marchal van Lare
-Nieuwvliet, The Netherlands








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Larry Cochrane <cochrane@..............>