PSN-L Email List Message
Subject: Did I get 12 second period ?
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?= jonfr@.........
Date: Sun, 24 May 2009 20:35:23 +0000
I did one little change to my lehman seismometer. I did rase the front
of the seismomter up from where it was. This appears to have incresed
it's period to about 12 seconds.
Here is are pictures of what I did.
I can send psn file to anyone how wants.
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