PSN-L Email List Message

Subject: Re: Incresing the period of a lehmans seismomter ?
From: "tchannel" tchannel@............
Date: Thu, 7 May 2009 07:38:06 -0600


Hi Geoffrey,  I like the way you word this.

Thanks, Ted


----- Original Message ----- 
From: "Geoffrey" 
To: 
Sent: Thursday, May 07, 2009 7:14 AM
Subject: Re: Incresing the period of a lehmans seismomter ?


> Isn't setting this period just a matter of
> positioning the lever arm as close to
> level as possible and still able to
> get it to seek a zero point reliably ?
>
> There should be a point where gravity will
> fail to overcome friction.
> That will be the limiting factor
> in how long a free period you may achieve.
>
> ----- Original Message ----- 
> From: "Jón Frímann" 
> 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.
> -- 
> Jón Frímann
>
> http://www.jonfr.com
>
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