PSN-L Email List Message

Subject: Re: SPRENGNETHER 201 LONG PERIOD VERTICAL SEISMOMETER
From: "meredith lamb" paleoartifact@.........
Date: Mon, 18 Aug 2008 11:10:57 -0600


James and Dick,

Have always wondered about the "original" two flat spring hinges (pivots)
themselves...i.e., just exactly what that material was, i.e., size:
thickness, width
specifically was.  Out of curiosity could you tell me what you have/use
now..., or even a hint of what you think you have/use now?

Gary,

They originally were "sold" to be capable of a 30 second period; the same as
the horizontals.  The actual use period "problem", in reality;  is
absolutely
limited to the ground pier setting stability....solid rock under the pier is
best, and loose soil is the worst for the frequency of adjustment/s.

Everyone,

Hmmm....I wonder how such a similar geometry setup might work, BUT instead
of spring hinges, with replace the two pivots with two boom end
steel/carbide flats on two mast fixed balls pivots like Chris Chapmans
current horizontal uses?  What do you think?  Amateur seismometry could
really use a better vertical design.

Take care, Meredith


On Mon, Aug 18, 2008 at 8:11 AM, Dick Webb  wrote:

> James,
>
> I am rather late to this thread, but I am running 201 and happen to have a
> brief publication from Sprengnether on it's theory and how to adjust the
> unit.  They rooted in their archives and found the article for me about 10
> years ago.
>
> Email me separately and I can fax a copy to you if it helps.
>
> Dick Webb
>
>
James and Dick,
 
Have always wondered about the "original" two flat spring hinges (pivots) themselves...i.e., just exactly what that material was, i.e., size: thickness, width
specifically was.  Out of curiosity could you tell me what you have/use now..., or even a hint of what you think you have/use now? 
 
Gary,
 
They originally were "sold" to be capable of a 30 second period; the same as the horizontals.  The actual use period "problem", in reality;  is absolutely
limited to the ground pier setting stability....solid rock under the pier is best, and loose soil is the worst for the frequency of adjustment/s.
 
Everyone,
 
Hmmm....I wonder how such a similar geometry setup might work, BUT instead of spring hinges, with replace the two pivots with two boom end
steel/carbide flats on two mast fixed balls pivots like Chris Chapmans current horizontal uses?  What do you think?  Amateur seismometry could
really use a better vertical design.  
 
Take care, Meredith
 
 
On Mon, Aug 18, 2008 at 8:11 AM, Dick Webb <dwebb002@.............> wrote:
James,

I am rather late to this thread, but I am running 201 and happen to have a brief publication from Sprengnether on it's theory and how to adjust the unit.  They rooted in their archives and found the article for me about 10 years ago.

Email me separately and I can fax a copy to you if it helps.

Dick Webb


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