Hi, 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 __________________________________________________________ Public Seismic Network Mailing List (PSN-L)
Larry Cochrane <cochrane@..............>