PSN-L Email List Message

Subject: Re: Incresing the period of a lehmans seismomter ?
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?= jonfr@.........
Date: Fri, 08 May 2009 01:08:52 +0000

Hi all

I got the period down to 6 seconds at the lower end, but at 4 seconds
the high end. But I have to do it adjust the period really slowly. I am
not sure what I can detect at 6 seconds.

Geoffrey, I know what you mean. I am trying to understand something in a
diffrent language and am trying to understand something that I have not
got a big traning on.

J=F3n Fr=EDmann.

On fim, 2009-05-07 at 17:04 -0700, Geoffrey wrote:
> 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 -----=20
> From: "J=F3n Fr=EDmann" 
> 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.


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