Jon,
Without damping, cause the pendulum to swing a few centimeters and =
record
how long it takes for the swing distance to drop to 1/2 the original =
width.
Also what is the resonant period?
Gary



-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... =
On
Behalf Of J=F3n Fr=EDmann
Sent: Tuesday, April 07, 2009 12:33 PM
To: psn-l@..............
Subject: Re: Changes to my Lehman sensor

Hi

I belive that I found the last problem (according to the idea). The last
problem is the alunium rod that I have used as an arm. I belive that it
was too soft to work properly and because of that I didn't behave
correctly.

I am going to replace it with iron based arm and there is going to be a
steel based end on it. I hope that gives me the resault that I want.

Regards.
J=F3n Fr=EDmann.

On =FEri, 2009-04-07 at 00:56 -0400, KipECS@....... wrote:
> Nice pictures, interesting construction technique and improvement
> =20
> In a message dated 4/6/2009 11:13:52 P.M. Eastern Daylight Time,
> jonfr@......... writes:
>
http://www.jonfr.com/myndir/v/geology/seismometer/p4070001.jpg.html
>=20


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