Larry, Jim and all,

For those searching for a "possible" vertical seismometer,
and/or exploring variations:

Georgia Tech has had a web reference to a interesting vertical
seismometer "for Classroom Demonstrations", since 1998.  It
appears to offer a "long adjustable period" (quite possibly
noteworthy, but ? on stability) per the text; however the dampening
and electronics is still "under development" since 1998 according
to the text.

I've not seen nor heard of any amateur that has followed
up and actually made a similar vertical such as this; but the aspect
of the "long period" (stability?) alone; might be worth considering.
If the stability (mass drift) is bad, it might still reasonably work
with a coil/magnet sensor.  I presume that it being a "teaching"
model that the abcense of dampening and even other variations
of a sensor apart from the photo resistor they used; could be
enticing for other better means by any amateur R&D explorer.
It would be nice to know if anyone on the PSN list has tried such?

Of course, with Georgia Tech being a teaching institution, it
could just be that this instrument is more meant to inspire just
enough curiosity about it, that people like me (and others) might
go further into it...ha.

http://quake.eas.gatech.edu/Instruments/LPVERT0.htm

For my netscape browser 4.7 version I did have trouble with
"Chapter 3", with acouple photos initially, but when I used the
web site URL: "Index of /Instruments", (below), the problem was
resolved there.

http://quake.eas.gatech.edu/Instruments/

The above also has "doc" files, which are Microsoft Word
versions.

Take care, Meredith Lamb

Larry Conklin wrote:

> Jim, I'd like to have a copy.  Right now I'm collecting as many ideas
> as I can find.  Since I live in a "seismicaly deprived" region
> (Central NY), I'm interested in sensors that are suitable for
> teleseismic events.Larry
>
>      ----- Original Message -----
>      From:Connie and Jim Lehman
>      To: psn-l@..............
>      Sent: Thursday, December 19, 2002 10:48 AM
>      Subject: Vertical design/1-sec
>       Larry C & others--   About 10 year ago at James Madison Un.
>      we devised a vertical instrument--made mostly from hardware
>      store items--I wrote the design up and will be glad to send
>      anyone a copy of construction details.  The unit is now in
>      the Moravian College seismic center in Bethlehem PA.
>      Write me a note at:                       J. Lehman  Physics
>      Dept.,                       James Madison
>      Un.                        Harrisonburg,
>      VA.                        22807
>



Larry, Jim and all,
For those searching for a "possible" vertical seismometer,

and/or exploring variations:
Georgia Tech has had a web reference to a interesting vertical

seismometer "for Classroom Demonstrations", since 1998.  It

appears to offer a "long adjustable period" (quite possibly

noteworthy, but ? on stability) per the text; however the dampening

and electronics is still "under development" since 1998 according

to the text.
I've not seen nor heard of any amateur that has followed

up and actually made a similar vertical such as this; but the aspect

of the "long period" (stability?) alone; might be worth considering.

If the stability (mass drift) is bad, it might still reasonably work

with a coil/magnet sensor.  I presume that it being a "teaching"

model that the abcense of dampening and even other variations

of a sensor apart from the photo resistor they used; could be

enticing for other better means by any amateur R&D explorer.

It would be nice to know if anyone on the PSN list has tried such?
Of course, with Georgia Tech being a teaching institution, it

could just be that this instrument is more meant to inspire just

enough curiosity about it, that people like me (and others) might

go further into it...ha.
http://quake.eas.gatech.edu/Instruments/LPVERT0.htm
For my netscape browser 4.7 version I did have trouble with

"Chapter 3", with acouple photos initially, but when I used the

web site URL: "Index of /Instruments", (below), the problem was

resolved there.
http://quake.eas.gatech.edu/Instruments/
The above also has "doc" files, which are Microsoft Word

versions.
Take care, Meredith Lamb
Larry Conklin wrote:

Jim, I'd
like to have a copy.  Right now I'm collecting as many ideas as I
can find.  Since I live in a "seismicaly deprived" region (Central
NY), I'm interested in sensors that are suitable for teleseismic events.Larry

----- Original Message -----

From:Connie
and Jim Lehman

To: psn-l@..............

Sent: Thursday, December 19, 2002
10:48 AM

Subject: Vertical design/1-sec
 Larry C & others--  
About 10 year ago at James Madison Un. we devised a vertical instrument--made
mostly from hardware store items--I wrote the design up and will be glad
to send anyone a copy of construction details.  The unit is now in
the Moravian College seismic center in Bethlehem PA.   
Write me a note at:                      
J. Lehman  Physics Dept.,                      
James Madison Un.                       
Harrisonburg, VA.                       
22807