Hi Jerry;

From the July 1979 Scientic American article.

  "You will want it midway across the crosspiece and on the pipe
so that when the rig is assembled, the wire will form an angle of from =
30
to 40 degrees with the horizontal."

Ed



  ----- Original Message -----=20
  From: Gary Lindgren=20
  To: psn-l@.................
  Sent: Friday, June 11, 2010 4:27 AM
  Subject: RE: Lehman Designs


  Hi Jerry,

  If you look at many of the designs you will see that typically the =
support wire from the boom to the vertical member is roughly 45 degrees. =
I'm not aware of any rules that govern the support angle. If the support =
angle is too low then the support wire tension gets too high.=20

  Gary

  =20

  =20

  =20

  =20

  =20

  Gary Lindgren

  585 Lincoln Ave

  Palo Alto CA 94301

  =20

  650-326-0655

  =20

  www.blue-eagle-technologies.com   Check out Lastest Seismometer =
Reading

  cymonsplace.blogspot.com=20

  sites.google.com/site/seismicsensorinfo/Home    Design Details for New =
Vertical Seismometer=20

  =20

  =20

  =20

  =20

  From: psn-l-request@.............. =
[mailto:psn-l-request@............... On Behalf Of GPayton
  Sent: Thursday, June 10, 2010 7:38 PM
  To: PSN Network List
  Subject: Lehman Designs

  =20

  Hi All,

  =20

  I was wondering if while designing (building) a horizontal Lehman type =
sensor, there was a ratio between the dimensions of the length of the =
pendulum arm and height of the vertical member?=20

  =20

  Thanks,

  Jerry



-------------------------------------------------------------------------=
-----



  No virus found in this incoming message.
  Checked by AVG - www.avg.com=20
  Version: 8.5.437 / Virus Database: 271.1.1/2930 - Release Date: =
06/10/10 18:35:00







 
Hi Jerry;
 
From the July 1979 Scientic American=20
article.
 
  "You=20
will want it midway across the crosspiece and on the pipe
so that =
when the=20
rig is assembled, the wire will form an angle of from 30
to 40 =
degrees with=20
the horizontal."
 
Ed
 
 
 

  
----- Original Message ----- 
  From:=20
  Gary=20
  Lindgren 
  
To: psn-l@.............. 
  
Sent: Friday, June 11, 2010 =
4:27 AM
  
Subject: RE: Lehman =
Designs
  


  

  
Hi=20
  Jerry,
  
If=20
  you look at many of the designs you will see that typically the =
support wire=20
  from the boom to the vertical member is roughly 45 degrees. I'm not =
aware of=20
  any rules that govern the support angle. If the support angle is too =
low then=20
  the support wire tension gets too high. 
  
Gary
  
 
  
 
  
 
  
 
  
 
  
Gary=20
  Lindgren
  
585 =
Lincoln=20
  Ave
  
Palo Alto =
CA=20
  94301
  
 
  
650-326-0655
  
 
  
www.blue-eagle-technologies.com  =20
  Check=20
  out Lastest Seismometer Reading
  
cymonsplace.blogspot.com 
  
sites.google.com/site/seismicsensorinfo/Home  =
 =20
  Design Details for New Vertical Seismometer=20
  
  
 
  
 
  
 
  
 
  

  
  
From:=20
  psn-l-request@.............. [mailto:psn-l-request@............... =
On=20
  Behalf Of GPayton
Sent: Thursday, June 10, 2010 7:38=20
  PM
To: PSN Network List
Subject: Lehman=20
  Designs
  
 
  

  
Hi All,
  

  
 
  

  
I was wondering if while designing (building) a =
horizontal=20
  Lehman type sensor, there was a ratio between=20
  the dimensions of the length of the pendulum arm and height =
of the=20
  vertical member? 
  

  
 
  

  
Thanks,
  

  
Jerry
  

  


  

No virus found in this incoming message.
Checked by AVG =
-=20
  www.avg.com 
Version: 8.5.437 / Virus Database: 271.1.1/2930 - =
Release=20
  Date: 06/10/10 18:35:00