PSN-L Email List Message

Subject: strange jumps
From: "John Tacinelli" John.Tacinelli@........
Date: Mon, 24 Jul 2000 21:36:45 -0500

My name is John Tacinelli and I am new to the list.  I have one of the =
Ward's seismographs.  It is working pretty well ( I picked up the Kodiak =
Island quake on the 10th.)  My problem is that at 8:45 PM every night I =
get a sudden increase (or decrease) in voltage through my amplifier that =
causes the trace to move off to the right hand side of the screen.  It =
stays there until 5:45 every morning.  Then it goes right back.  The =
seismograph itself doesnt seem to move.  I have run it on an uninterruptibl=
e power supply and it still does it.  I watched it happen tonight and I =
could detect no environmental change in the area of the seismograph. =20
The seismograph is set up at the school where I teach.  Maintenance =
thought it might be the outside lights turning on but that happens much =
earlier.  That timing happens to coincide with the setting and rising of =
the sun (pretty close) but I can't think of anything solar that could =
affect a magnetic coil inside a building in a time span of about 2 =
seconds. I should mention that I have contacted Wards and they are =
stumped.  Also the timing seems to be getting earlier, both in the evening =
and morning by about 30-40 seconds every day.  If anyone can help me out I =
would really appreciate it since this problem is very vexing.  Thanks =
alot.  I hope to be a regular contributor and I look forward to hearing =
from you all.

John Tacinelli
Earth Science Instructor
Rochester Community and Technical College

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Larry Cochrane <cochrane@..............>