PSN-L Email List Message

Subject: Re: Equipment: SG vs. Lehman...Hybrid
From: "meredith lamb" mlamb1@.........
Date: Thu, 24 May 2001 22:58:09 -0700

Hi Mark,

I'd think that the horizontal instruments mass would drift too
much over time, which in turn would misalign the ideal
"normal" S-G's sensors output whether capactive or Hall effect
(or etc.). Sometimes it would work, and often not, as normally
its only a very small area of tolerable "drift" allowance.  
Its hard for amateurs to get away from the "preferred" coil/magnet
approach, for its simplicity and wide range of drift
tolerance.....however, it can be fun to try out things that 
seem like they might work....I try stuff all the time...ha.

Regards, Meredith Lamb

Mark Andrews wrote:

> Dear Everyone,
> It seems like the thing to do then is build Lehman with a displacement
> sensor similar to the one found on a Shackleford-Gundersen seismometer in
> place of the magnet and coil on the boom of the Lehman.
> I have not heard of anyone doing this.  Is there a reason?  Something I
> have not taken into consideration?


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