PSN-L Email List Message

Subject: Re: Incresing the period of a lehmans seismomter ?
From: "Geoffrey" gmvoeth@...........
Date: Thu, 7 May 2009 17:04:41 -0700


Gee, I believe this to be one of those
garden gate seismometers.
I always thought of it as a modified
pendulum changing the acceleration of gravity
in a trigonometric fashion.
This means the mass is the lowest point on the lever arm
or you can not have stability.
It manipulates the pull of gravity
like Sine or Cosine of the angle relative
to horizontal.
I believe you guys are thinking much more
complex then myself.
You more than likely will never
take souls like me very serious.
Sort of like Rodney Dangerfield ???

----- Original Message ----- 
From: "Jón Frímann" 
To: "PSN-Postlist" 
Sent: Wednesday, May 06, 2009 7:54 PM
Subject: Incresing the period of a lehmans seismomter ?


Hi all

Tomorrow I am going to make the final changes to my lehman seismomter. I
hope that this changes make the seismomter get down to 20 seconds period
at most.

The only thing that I need to know is this. What is the best way to
increase the period of my lehman seismomter ? Moving the boom down or
up ? Or do I have to do something else.

Regards.
-- 
Jón Frímann

http://www.jonfr.com

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