Meredith and Dick
My Spremgnether has two hinges made out of wire and looks like thick =
piano wire about 3/4 the thickness of pencil lead.   Additionally, =
instead of wires being attached to each ends of the spring attachments =
each end of the spring has a straight length that goes into the =
adjusment nuts.
James
  ----- Original Message -----=20
  From: meredith lamb=20
  To: psn-l@.................
  Sent: Monday, August 18, 2008 10:10 AM
  Subject: Re: SPRENGNETHER 201 LONG PERIOD VERTICAL SEISMOMETER


  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? =20

  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. =20

  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








Meredith and Dick
My Spremgnether has two hinges made out =
of wire and=20
looks like thick piano wire about 3/4 the thickness of pencil =
lead.  =20
Additionally, instead of wires being attached to each ends of the spring =

attachments each end of the spring has a straight length that goes into =
the=20
adjusment nuts.
James

  
----- Original Message ----- 
  From:=20
  meredith lamb 
  
To: psn-l@.............. 
  
Sent: Monday, August 18, 2008 =
10:10=20
  AM
  
Subject: Re: SPRENGNETHER 201 =
LONG PERIOD=20
  VERTICAL SEISMOMETER
  


  

  
James and Dick,
  
 
  
Have always wondered about the "original" two flat spring hinges =
(pivots)=20
  themselves...i.e., just exactly what that material was, =
i.e., size:=20
  thickness, width
  
specifically was.  Out of curiosity could you tell me what =
you=20
  have/use now..., or even a hint of what you think you have/use =
now? =20
  
  
 
  
Gary,
  
 
  
They originally were "sold" to be capable of a 30 second period; =
the same=20
  as the horizontals.  The actual use period "problem", in reality; =

   is absolutely
  
limited to the ground pier setting stability....solid rock =
under the=20
  pier is best, and loose soil is the worst for the frequency of=20
  adjustment/s.
  
 
  
Everyone,
  
 
  
Hmmm....I wonder how such a similar geometry setup might work, =
BUT=20
  instead of spring hinges, with replace the two pivots =
with two boom=20
  end
  
steel/carbide flats on two mast fixed balls pivots like Chris =
Chapmans=20
  current horizontal uses?  What do you think?  Amateur=20
  seismometry could
  
really use a better vertical design.  
  
 
  
Take care, Meredith
  
 
  
 
  
On Mon, Aug 18, 2008 at 8:11 AM, Dick Webb =
<dwebb002@.............>=20
  wrote:

  
James,

I=20
    am rather late to this thread, but I am running 201 and happen to =
have a=20
    brief publication from Sprengnether on it's theory and how to adjust =
the=20
    unit.  They rooted in their archives and found the article for =
me about=20
    10 years ago.

Email me separately and I can fax a copy to you =
if it=20
    helps.

Dick=20
Webb