I=A0have build the Inyo FBV seismometer, and in spite of my rough construct=
ion skills, am quite pleased with its performance.=A0 Its output is posted =
in=A0heliplot display images and selected recent seismograms at=A0http://al=
abamaquake.com/.
=A0
I am currently working to get the instrument installed in its hermetic case=
, to hopefully drive down some of the local noise due to weather and air pr=
essure effects.
=A0
Steve

--- On Fri, 11/18/11, Gary Lindgren  wrote:


From: Gary Lindgren 
Subject: RE: Spring for AS-1 type vertical seismometer
To: psnlist@..............
Date: Friday, November 18, 2011, 12:21 PM


If you want a high quality vertical seismometer I suggest you think along
the line of a Force Balance Vertical (FBV) seismometer. See
https://sites.google.com/site/seismicsensorinfo/ as a starting point. There
are several people that have built these and are very open for support and
answer questions.
Gary







-----Original Message-----
From: psnlist-request@.............. [mailto:psnlist-request@...............
]
On Behalf Of tdavisjb
Sent: Thursday, November 17, 2011 9:37 PM
To: PSN Listserver
Subject: Spring for AS-1 type vertical seismometer

Folks,
I am building a vertical seismometer based on drawings put together by Kay
Wyatt (with help from Chris Chapman), it uses a piano wire hinge and the
coil is attached to the boom. My current problem is locating a spring for
this thing. I have found one at the local hardware store, it's long enough
(about 14") but it's pretty large in diameter and perhaps a bit too stiff.=
=20
I have tried to contact Kay but have had no luck. I work in a middle school
here in Portland (I'm the tech support person) and we have 2 AS-1's that I
maintain. Their springs are much smaller in diameter. So I am wondering if
any one on the list knows where, or how I would go about obtaining such a
spring.
I might mention that I have built two horizontal seismometers based on=A0 t=
he
design that Chris Chapman helped to design in England for use in schools.
They use crossed carbide rods for hinges. I wound my own coils and hope to
have them up and recording within a year (being realistic here, as I have
been working on all three seismometers, on and off for almost a year
already). So I may be asking more questions!
Thanks in advance for any help. You can respond here or email me direct:
tdavisjb@............



__________________________________________________________

Public Seismic Network Mailing List (PSNLIST)

To leave this list email PSNLIST-REQUEST@.............. with the body of th=
e
message (first line only): unsubscribe See
http://www.seismicnet.com/maillist.html for more information.

__________________________________________________________

Public Seismic Network Mailing List (PSNLIST)

To leave this list email PSNLIST-REQUEST@.............. with=20
the body of the message (first line only): unsubscribe
See http://www.seismicnet.com/maillist.html for more information.
I have build the Inyo FBV seismomet=
er, and in spite of my rough construction skills, am quite pleased with its=
 performance.  Its output is posted in heliplot display images an=
d selected recent seismograms at =
http://alabamaquake.com/.
 
I am currently working to get the instrument installed in its hermetic=
 case, to hopefully drive down some of the local noise due to weather and a=
ir pressure effects.
 
Steve

--- On Fri, 11/18/11, Gary Lindgren <gel@theconn=
ection.com> wrote:


From: Gary Lindgren <gel@.................>=

Subject: RE: Spring for AS-1 type vertical seismometer
To: psnlist@w=
ebtronics.com
Date: Friday, November 18, 2011, 12:21 PM


If you want a high quality vertical seismometer I su=
ggest you think along
the line of a Force Balance Vertical (FBV) seismom=
eter. See
https://sites.google.com/site/seismicsensorinfo/ as a st=
arting point. There
are several people that have built these and are ver=
y open for support and
answer questions.
Gary





=


-----Original Message-----
From: psnlist-request@.............. [mail=
to:psnlis=
t-request@..............]
On Behalf Of tdavisjb
Sent: Thursday, N=
ovember 17, 2011 9:37 PM
To: PSN Listserver
Subject: Spring for AS-1 =
type
 vertical seismometer

Folks,
I am building a vertical seismometer=
 based on drawings put together by Kay
Wyatt (with help from Chris Chapm=
an), it uses a piano wire hinge and the
coil is attached to the boom. My=
 current problem is locating a spring for
this thing. I have found one a=
t the local hardware store, it's long enough
(about 14") but it's pretty=
 large in diameter and perhaps a bit too stiff. 
I have tried to contact=
 Kay but have had no luck. I work in a middle school
here in Portland (I=
'm the tech support person) and we have 2 AS-1's that I
maintain. Their =
springs are much smaller in diameter. So I am wondering if
any one on th=
e list knows where, or how I would go about obtaining such a
spring.
=
I might mention that I have built two horizontal seismometers based on =
; the
design that Chris Chapman helped to design in England for use in s=
chools.
They use crossed carbide rods for hinges. I wound my own
 coils and hope to
have them up and recording within a year (being reali=
stic here, as I have
been working on all three seismometers, on and off =
for almost a year
already). So I may be asking more questions!
Thanks=
 in advance for any help. You can respond here or email me direct:
tdavisjb@............

<=
BR>
__________________________________________________________

Pu=
blic Seismic Network Mailing List (PSNLIST)

To leave this list email=
 PSNLIST-=
REQUEST@.............. with the body of the
message (first line only=
): unsubscribe See
http://www.seismicnet.com/maillist.html for more
 information.

______________________________________________________=
____

Public Seismic Network Mailing List (PSNLIST)

To leave t=
his list email PSNLIST-REQUEST@.............. with 
the body of the message (=
first line only): unsubscribe
See http://www.seismicnet.com/maillist.html f=

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