Yes, i have played with this before.
To get a 5 second period is difficult.
I guess i will just stay with a SPZ
and try overdamping or ???

----- Original Message ----- 
From: "Randall Pratt" 
To: 
Sent: Tuesday, June 14, 2011 8:42 PM
Subject: Seismograph pictures


> Geoff,
> 
> 
> 
> Look at the simulator provided my Bob McClure at this site.
> http://sites.google.com/site/bobmcclure90/springcalc  It will help you
> design a longer period but you will see that after 3 seconds just a very
> small change becomes unstable.  I have not measured G.  The coil is not very
> good and I did not intend it as permanent.  Even so it is working well for
> the near term.  I need a larger diameter center pole extension and then to
> make a coil of finer wire that fits the pole.
> 
> 
> 
> Randall L. Pratt
> 
> Youth for Understanding Area Representative
> 
> rpratt@.............
> 
> 
> 
>
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