Hi Jon,
The "TILT" of your seismometer will determine the period.
A good reference article can be found here

http://jclahr.com/science/psn/swing/index.html

regards
Dale

----- Original Message ----- 
From: "Jón Frímann" 
To: "PSN-Postlist" 
Sent: Thursday, May 07, 2009 12:54 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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