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
sensitivity and the length of 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 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 
>
>
>
>
>
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 

sensitivity and the length of 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 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