The URL for Randall Peters' vertical seismometer needs a period between =
the z and the html:

http://physics.mercer.edu/hpage/new-z.html

Regards,

Les
  ----- Original Message -----=20
  From: meredith lamb=20
  To: psn-l@.................
  Sent: Saturday, August 23, 2008 11:23 AM
  Subject: Re: Verticle Sensor Design


  Hi Gary and all,

  Amateur verticals (the more popular published ones), as you've =
probably noticed, are really shall we say; quite diverse in their final
  published suggested sensor pickup use.   Obviously, one can build the =
selected mechanical equivalent and substitute whatever output
  sensor you really know/feel comfortable making/building/using and =
henceforth go from there inasfar as electronic amplification, period
  extension, feed back and so on....at least in what is available for =
such choice.

  If one really gets down to the nitty-gritty...its going to be the old =
coil-magnet models that 95% of the amateurs will actually build in
  my opinion.  Complicated sensor electronics is for those that already =
possess the ability, tools, material and  time to devote in the
  building for doing so.  Its too bad that the electronic circuits for =
some can't be bought.

  Although I've not yet tried to duplicate any of the published models; =
their is one in particular that (mechanically) really draws my
  interest and it offers a variety of improvements that I think is worth =
paying ALOT more attention to.  Its the Randall Peters vertical at:

  http://physics.mercer.edu/hpage/new-zhtml

  The web site details offer up very significant pivot friction lowering =
points; but doesn't delve into any amateur construction details.
  If one mechanically "thinks outside the box", its likely that a wide =
variety of some substitutions of material could be arrived at.

  Note the front two leveling screws; that setup will help give more =
mechanically stability.  A square frame overall, can help for
  stability and afixing whatever sensor arrangement thats desired.  The =
spring "looks" like a common hardware store door spring; but
  it may have been cut to a certain length (?).

  How would it be with a coil-magnet sensor (?), I really don't know; =
but I'am sure it will be much better in overall mass enertia=20
  sensitivity and the length of the period will be noteably longer than =
any other low cost model thats presently around.

  Take care, Meredith



  =20


  On Fri, Aug 22, 2008 at 3:39 PM, Gary Lindgren  =
wrote:

    With all the discussion about the Sprengnether lately it got me =
thinking that I need to get my plans together for a vertical sensor. Not =
to long ago someone mentioned a good design for a vertical seismometer. =
Is there a picture handy and some words of advice.

    Thank you,

    Gary













    Gary Lindgren

    585 Lincoln Ave

    Palo Alto CA 94301



    650-326-0655



    www.blue-eagle-technologies.com

    cymonsplace.blogspot.com=20













The URL for Randall Peters' vertical =
seismometer=20
needs a period between the z and the html:
 
http://physics.mercer=
..edu/hpage/new-z.html
 
Regards,
 
Les

  
----- Original Message ----- 
  From:=20
  meredith lamb 
  
To: psn-l@.............. 
  
Sent: Saturday, August 23, 2008 =
11:23=20
  AM
  
Subject: Re: Verticle Sensor =
Design
  


  
Hi Gary and all,

Amateur verticals (the more =
popular=20
  published ones), as you've probably noticed, are really shall we say; =
quite=20
  diverse in their final
published suggested sensor pickup use. =
 =20
  Obviously, one can build the selected mechanical equivalent and =
substitute=20
  whatever output
sensor you really know/feel comfortable=20
  making/building/using and henceforth go from there inasfar as =
electronic=20
  amplification, period
extension, feed back and so on....at least in =
what is=20
  available for such choice.

If one really gets down to the=20
  nitty-gritty...its going to be the old coil-magnet models that 95% of =
the=20
  amateurs will actually build in
my opinion.  Complicated =
sensor=20
  electronics is for those that already possess the ability, tools, =
material=20
  and  time to devote in the
building for doing so.  Its =
too bad=20
  that the electronic circuits for some can't be bought.

Although =
I've=20
  not yet tried to duplicate any of the published models; their is one =
in=20
  particular that (mechanically) really draws my
interest and it =
offers a=20
  variety of improvements that I think is worth paying ALOT more =
attention=20
  to.  Its the Randall Peters vertical at:

http://physics.mercer.edu/hpage/new-zhtml

The =
web=20
  site details offer up very significant pivot friction lowering points; =
but=20
  doesn't delve into any amateur construction details.
If one =
mechanically=20
  "thinks outside the box", its likely that a wide variety of some =
substitutions=20
  of material could be arrived at.

Note the front two leveling =
screws;=20
  that setup will help give more mechanically stability.  A square =
frame=20
  overall, can help for
stability and afixing whatever sensor =
arrangement=20
  thats desired.  The spring "looks" like a common hardware store =
door=20
  spring; but
it may have been cut to a certain length =
(?).

How would=20
  it be with a coil-magnet sensor (?), I really don't know; but I'am =
sure it=20
  will be much better in overall mass enertia 
sensitivity and the =
length of=20
  the period will be noteably longer than any other low cost model thats =

  presently around.

Take care, =
Meredith



 


  
On Fri, Aug 22, 2008 at 3:39 PM, Gary =
Lindgren <gel@.................> wrote:

  

    

    

    
With all the discussion about the Sprengnether lately it got me =
thinking=20
    that I need to get my plans together for a vertical sensor. Not to =
long ago=20
    someone mentioned a good design for a vertical seismometer. Is there =
a=20
    picture handy and some words of advice.
    
Thank you,
    
Gary
    
 
    
 
    
 
    
 
    
 
    
 
    
Gary=20
    Lindgren
    
585 =
Lincoln=20
    Ave
    
Palo =
Alto CA=20
    94301
    
 
    
650-326-0655
    
 
    
www.blue-eagle-technologies.com
    
cymonsplace.blogspot.com 
    
 
    =