PSN-L Email List Message

Subject: Re: new seismo
From: Jack Ivey ivey@..........
Date: Sat, 6 Aug 2011 19:13:45 -0400

It may be vibrating in an unintended mode, such as vertical motion of the p=
endulum.  Try twanging it with your finger.  Is your coil set up to be sens=
itive to motion in the vertical direction as well as horizontal?=

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