> How do I determine the mass size of the pendulum for a Lehman seismometer.
> Is there a method to the madness?
> 
> Gary--just a note on the original determination of the mass.  I chose a 5lb.
piece of lead as it was available & handy.  For the dimensions of the boom, the
lead was not excessive weight, and seemed to be sufficient mass for stability,
and was able to be supported by piano wire without undo fatigue.  The system
worked beyond our original expectations, but there have been modifications &
improvements, so don't fear to experiment around with other suggestions that
float by.  A working design is empirical by nature--best wishes--Jim Lehman 
> 
>  
> 
> Gary Lindgren
> 
> 585 Lincoln Ave
> 
> Palo Alto CA 94301
> 
>  
> 
> 650-326-0655
> 
>  
> 
> www.blue-eagle-technologies.com
> 
> cymonsplace.blogspot.com   
> 
>  
> 
>  
> 
> 

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