Sorry about the delay in getting back to you.  I was in a bad accident 
followed by surgery and physical therapy. But I am happy to say that I am 
now walking again and back at my computer.

The AS-1 came with 2 sizes of springs.  The early AS-1s had a very narrow 
diameter spring and the newer AS-1s came with a 3/8" diameter spring.  I 
used McMaster-Carr for about 3/4 of the items that I needed for the 
seismometer.  The spring that I used is their part number 9664k19 described 
as "Spring-Tempered Steel Cont Extension Spring 36" Length, 3/8" Outside 
Diameter, .035" Wire":
    http://www.mcmaster.com/#9664k19/=ezpnh8

Another question that I get asked often is what type of wire I used for the 
pivot point.  I ordered it from www.SmallParts.com which is another supplier 
that I like.  It is called "music wire" and is .020 inches in diameter.  The 
part number is SMW-020-36-10 and is at
    http://www.smallparts.com/dp/B001383CPS/ref=sp_dp_g2c_asin
I have plenty extra of the music wire if you want me to mail it to you.

I order all of my magnets from K&J Magnetics at www.kjmagnetics.com
The magnetic damping devices requires four of part #BX084 which are 1" x 
1/2" x 1/4"
The sensor assembly requires four of part #BX0X02 which are 1" x 1" x 1/8"

I have a complete part list that I can supply anybody that wants it.

Thanks!
Kay Wyatt



-----Original Message----- 
From: 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.
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  the
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@............



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