PSN-L Email List Message
Subject: Lehman construction question
From: "Jim Martin" jimdmartin@................
Date: Sun, 7 Jul 2002 16:30:14 -0500
I am a new member to this list, and am also building my first Lehman seis.
I have a couple of questions:
1). I am using a 1/2" steel threaded rod for the boom. Will this be ok,
or should the boom be of non-ferrous material?
2). Is there a recommended distance between the boom pivot point and the
boom support wire attachment point?
I know that initially the boom wire pivot should lead the boom pivot by
about 1cm, but I am just curious if there is a recommended max distance
from boom to upper crossarm.
Thanks to everyone....
Jim D. Martin
Fort Wayne, Indiana
Public Seismic Network Mailing List (PSN-L)
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