There is a little bit more information about the EQ-1 on this website:
http://www.nexgensci.com/store/pc/viewPrd.asp?idcategory=3D2&idproduct=3D=
1#details

If you choose to purchase the EQ-1, the Ward's website is cheaper.  =
Also, sign up for the Ward's newsletter first.  You will receive a =
"welcome" email from their newsletter that gives you a 10% discount on =
your next purchase from Ward's.  This reduces the price further from =
$499 to $449.  A cover is essential, but the one they offer is $100.  =
You can find cheap glass aquariums at your local pet store for much =
less.

Their system still uses the older oil damping method.  As Chris Chapman =
and so many others have pointed out, it is full of problems.  Most =
notably, the damping changes with temperature.  So you would need to =
change it to magnetic damping.  See Chris Chapman's magnetic damping =
design at=20
http://jclahr.com/science/psn/chapman/as1%20damping/index.html
or John Lahr's version of Chris's design at=20
http://jclahr.com/science/psn/chapman/as1%20damping/lahr/index.html


  ----- Original Message -----=20
  From: Edward Ianni=20
  To: psn-l@.................
  Sent: Monday, December 22, 2008 4:17 PM
  Subject: Vertical School Seismometer | WARD'S Natural Science


  This link may be more direct.









There is a little bit more information about the =
EQ-1 on=20
this website:
http://www.nexgensci.com/store/pc/viewPrd.asp?idca=
tegory=3D2&idproduct=3D1#details
 
If you choose to purchase the EQ-1, the Ward's =
website is=20
cheaper.  Also, sign up for the Ward's newsletter first.  You =
will=20
receive a "welcome" email from their newsletter that gives you a 10% =
discount on=20
your next purchase from Ward's.  This reduces the price further =
from $499=20
to $449.  A cover is essential, but the one they offer is =
$100.  You=20
can find cheap glass aquariums at your local pet store for much=20
less.
 
Their system still uses the older oil damping=20
method.  As Chris Chapman and so many others have pointed out, it =
is full=20
of problems.  Most notably, the damping changes with =
temperature.  So=20
you would need to change it to magnetic damping.  See Chris =
Chapman's=20
magnetic damping design at 
h=
ttp://jclahr.com/science/psn/chapman/as1%20damping/index.html<=
/DIV>
or John Lahr's version of Chris's design at =

http://jclahr.com/science/psn/chapman/as1%20damping/lahr/index.html
 
 

  
----- Original Message ----- 
  From:=20
  Edward=20
  Ianni 
  
To: psn-l@.............. 
  
Sent: Monday, December 22, 2008 =
4:17=20
  PM
  
Subject: Vertical School =
Seismometer |=20
  WARD'S Natural Science
  


  
This link may be more =
direct.
  
 
  
 
http://wardsci.c=
om/product.asp_Q_pn_E_IG0018602=20