This would be more properly called a drum recorder.  I believe that this
unit includes amplifiers suitable for direct connection to a =
seismometer.
There would also be a way to time events. These units were commonly used =
for
chasing aftershocks, volcanoes, and geothermal events. You load up a =
dozen
or so and go off to the site of an interesting earthquake, record the
aftershocks, and find the fault plane.

These systems have been replaced by solid-state digital systems, but =
drum
recorders are nice for display seismographs. You can watch the =
earthquakes
happen without resorting to a computer monitor.

Doug Crice=20

-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... =
On
Behalf Of BOB BARNS
Sent: Monday, September 26, 2005 6:29 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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