PSN-L Email List Message

Subject: RE: Lehman design questions
From: mbrewer mbrewer@......
Date: Sun, 2 Jan 2000 11:42:29 -0400

I am using threaded rod on my two Lehmans.  One is brass the other is 
stainless steel (stainless steel is non-magnetic).  I drilled and tapped 
home-cast lead weights for both.  This makes it easy to position the 
weights on the boom.  I locked the weights in place with stainless steel 
nuts and washers.

I use two weights either side of the magnet so that the balance point of 
the boom assembly, when suspended vertically by the support wire, is close 
to the magnet itself.

Martin Brewer,

-----Original Message-----
From:	JIM MARTIN [SMTP:jdmartin@...............
Sent:	Friday, December 31, 1999 5:42 PM
To:	PSN-L@..............
Subject:	Lehman design questions

To anyone who wishes to help:

Has anyone used a piece of threaded rod for the boom,  or is it better to
stick with an aluminum dowel,  say 1/2" in dia. ?

Jim Martin
New Haven, Indiana


Public Seismic Network Mailing List (PSN-L)


Public Seismic Network Mailing List (PSN-L)

[ Top ] [ Back ] [ Home Page ]

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