If you consider the science of external ballistics
you will find the greater the mass and density the
less effect air movemenr will have on it.
Otherwise use a small mass several times the boom
mass and put in all under a vacuum with
magnetic damping.

Static friction is the only nasty thing to deal with
as I understand it. It tends to lock things into place
till you get enough force to overcome it.

If you do not have the ability to
produce and maintain a vacuum
I think a spherical shape may
be the best for the mass.

I have often thought it would be nice
to have a very very sensitive bathroom scale
and put a gallon of water on it
then look for the noise level.

Not sure of any of this it just seems common senseical :-)



----- Original Message ----- 
From: "Gary Lindgren" 
To: 
Sent: Monday, March 31, 2008 5:40 PM
Subject: Determining Mass Size for Lehman Seismometer


> How do I determine the mass size of the pendulum for a Lehman seismometer.
> Is there a method to the madness?
> 
> Gary
> 
> 
> 
> Gary Lindgren
> 
> 585 Lincoln Ave
> 
> Palo Alto CA 94301
> 
> 
> 
> 650-326-0655
> 
> 
> 
> www.blue-eagle-technologies.com
> 
> cymonsplace.blogspot.com   
> 
> 
> 
> 
> 
>
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