PSN-L Email List Message

Subject: RE: Lehman magnet/coil position
From: steve hammond shammon1@.............
Date: Thu, 3 Oct 2002 16:09:51 -0700

Hi Richard, there is no war-- it's an art form... I put the magnet on the 
boom because I don't have to contend with the coil wires interfering with 
the operation of the boom. I also build the cement pad and the box to house 
the device so I have control over the choice of screws (brass) which I use 
near the device.  One of the biggest down sides of putting the magnet on 
the boom is that any metal in the cement floor etc. or near the boom can 
attract the boom and cause operational issues. So think about where and how 
you will install the device and then make the decision. If you go with the 
coil on the boom, then you need to make sure the connection wires do not 
interfere with the operation of the boom. I have seen very fine gauge wire 
used which has been coiled to increase flexibility.
Regards, Steve Hammond PSN San Jose, Aptos, CA

-----Original Message-----
From:	Richard Gagnon [SMTP:richg_1998@..........
Sent:	Thursday, October 03, 2002 2:34 PM
To:	psn
Subject:	Lehman magnet/coil position

I hope this does not start another war.
I am building a Lehman and I wonder if the coil on the boom is better than 
magnet on the boom or is it not an issue? From what I have seen, building
seismometers seems to be an art form. Thank you.

Richard Gagnon
Easthampton MA.

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