It's a portable Helicorder.  Looks like it is the stylus=20
version rather than the pen version.  This means you need to use=20
smoked paper or find the ink pen kit somewhere.  It wants 2 sealed=20
12V batteries to run properly.  You can set the speed of the=20
drum and line spacing and it has a wide range of input gains (down to=20
tens of mV/cm).  Some of them also include time mark generators=20
that synchronize to WWV/WWVH and are wonder of early=20
microprocessor technology (1980?).

I don't see the stylus itself, and the arm that the stylus attaches
to looks like it has been bent and "unbent", but that shouldn't
be a big problem.

Jack

-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@...............
On Behalf Of BOB BARNS
Sent: Monday, September 26, 2005 9:29 AM
To: psn mail
Subject: ebay auction

Hi gang,
      Teledyne Geotech Portacorder RV-320 Seismograph
	Item number: 7549331565	  ends Oct 2

   I'm guessing that it is a stripchart recorder.

Bob

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